I have a 69 Nova and have everything to install my twin turbos except the headers and intercooler. Below is a link to the only thing I found that might work for our cars. The price is kinda steep so I may just buld my own. That way I can get them exactly where I want them the first time. I have studied this some and some guys say heavy wall steel tubing ceramic coated is the best way to do this to prevent cracking. But others are saying stainless is the best but needs to be coated as well. If you find anything else let me know too.
http://www.forcedpsi.com/catalog.html