Take the cam gear and chain off the cam. The chain should drop down off the crank gear. Been a while, but I think thats it.
I took the cam gear off the camshaft pulled it forward a bit but I can’t get the chain to come off. There is not enough slack to get it off either of the gears.
Get the cam gear off of the camshaft ( unbolt it and tap it off ) and the chain will be free to fall and come off with the crankshaft gear
As best I can recall the crankshaft gear on these engines can be removed and replaced so moving that gear forward might help to get the chain off the gears
A new chain and gears will bring the engine back to a new kind of smoothness and performance like when the engine was newer
Those parts are the heart of the engines timing which controls the engines performance more than anything else
Replacing those parts in my own 429 was one of the very best things I did to bring the engine back to new engine performance and a must do if these engines have close to 100,000 miles in these years
The engines in these years were worn out at 100,000 miles in these days requiring engine work or a complete rebuild unlike the Cnc machined engines built today
The new performance will make you a happy camper and enjoy your Classic Antique Cadillac even more than ever