Is there an interest in a polyurethane bushing that could replace the stock rear bushings without the need to change trailing arms? Just wondering.

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Aha! I think I figured out when this happened. Back in March 1987 the rear end gears were loud. The shop I brought the car to swapped out the rear end. Now I know they swapped it with 64 rear end and left the trailing arms on it. Good thing you didn't notice and deduct points at the 2018 GN in San Marcos : )

And as Paul Harvey would say - "And now you know the rest of the story." Glad you got it figured out.  ps.. I'll be sure to ding you at the next GN! Just kidding. Even I would be hard pressed to ding someone even if I noticed it.  I enjoy judging but when you have to cover a car in 30 to 45 minutes and include operation, condition, workmanship AND originality spanning dozens of categories, things get missed, especially on the hot payment under a car down in Texas! Now put a 64 air cleaner housing with the wide snorkel on a 63 390... you will get dinged! LOL  

  I sure think that the price for the repair was very reasonable !!

Based on the difference in the look of the two year trailing arms if they look like the 64 and are in a 63 then someone has changed them and not factory 

Most likely done by an owner to replace old worn bushings in the arms and keep the car rolling 

Stay Safe 

This is an interesting topic. I know my 62 came with 63 style heads. The only difference in the heads is that the top corners of the 63 head have an infill area to allow the 63 and later valve covers to seal properly. The 62 and earlier valve covers have square corners all around while the 63 and later have curved upper corners and a more modern style including Cadillac in script instead of block letters. In this case, I expect Cadillac was ramping up for the new 63 engine and got out in front on head production while still working out the 63 block. Who knows, maybe the 63 engine was scheduled for 62 but came to production late. The 62 is the 60 year anniversary Cadillac and they may have been trying to get the new engine ready for the big event. 1962 introduced cornering lamps for the first time and a dual master cylinder braking system. 

58 to 63 replacement heads were the same per Master Parts Book by 1965. The 1963 heads had a casting # 1479831 but recall some of the earlier heads may have had a different casting # and slightly different. It was typical for Cadillac (and all other car makes) to have a slightly (or sometimes very) different replacement parts. I I  know I have sold quite a few 1963 heads that went on 1958 to 1962 Cadillacs over the years. Here's the 1965 Master Parts Listing:
  

 Pretty interesting. The the 62 and newer heads will work with the all valve covers while 61 and older heads need the older square cornered valve covers because they don't have the filled in upper corners. I took photos of this years ago, I will see if I can find them.

Jason, here are the promised photos, The first is a 1961 head, I know, pretty crusty! I collected a few junk heads so I could band saw them apart and see where the danger spots were when enlarging the runners and ports but that's another story for another day. The second photo is one of my original 62 heads when I was thinking of putting 63 covers on them. The third is a 63 head that t found along with a donor tranny and diff. 

You can see that a 63 or later valve cover would definitely not seal on the 61 or older head. 

Attachments:

Dan,  wat are those silver pins were the valve cover screws go and there purpose

Thanks

Kim, those are aftermarket valve cover bolts. They have a nice load spreading base washer affair that helps tired tin seal better. I didn't end up using them as I went back to my aluminum Offenhauser valve covers which seal very nicely. Good thing mine isn't a points car!

If I may 

Those are just different valve cove hold downs to make removing the valve coves easier to remove 

Some come with a T handle and most often used on engines with solid lifters that require removing the valve covers more often to be adjusting the valve clearances with feeler gauges or a dial indicator type tool ( forgot the name of the one I had ) 

Stay safe 

Yep, I knew they were different .. should have a completely different casting # which I thought I had on file but cannot find. Do  you have the casting #'s? I would like to have that for reference. 

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