Have only seen the Sanders long headers in the past that were less than a plug and play item needing modifications to the long headers to not lay against the engines oil pan on the passenger side when installed and a somewhat challenging installation in general
The other issue is you having to make an alternator bracket to be mounting the alternator which still needs to be done with the shorties
First time I have seen —-the Shorty headers for sale anyplace
With the passenger side of the 429 exhaust getting more difficult to acquire as time marches on this might be an interesting solution to that problem
They do not fit. Many have tried. They fit 65 and up 429.
A bit more research and I do agree they are not right for our years due to the frames design which changed in the later years