This slant six turbo mount has a lot going for it and could be manufactured for very little money, I think.
It has the advantage of not requiring any welding on the cast iron manifold itself (a BIG advantage since those stock manifolds crack for no reason at all, and welding on them just makes it more likely that they will crack.) It fits an A body like a glove.
It's truly a "bolt-on."
All you need are two flanges (one to bolt to the manifold and a turbo mounting flange to weld to the other end,) and a piece of "J" pipe, 2.50" in diameter with a short-radius bend in it (about 180 degrees.) The picture says it all.
This was designed my FABO member PISHTA. Talk to him for particulars...