Looking for specific C6 for a project

I'm putting my 545 stroker in a '32 'glass 3 window and am looking for a short shaft C6 with a BB (351m/400/429/460) bellhousing pattern. Documentation is sketchy but have been told it was used in some late 70s F250s, 76-77 High Boys, and various other 4x4's with divorced transfer cases. Unfortunately, in Calif there are no wrecking yards left so finding one close is even more difficult.
If anyone can give me a better idea of what these were used in it would make finding one much easier.

ph Art @ Transmission cores (Caif) 510-783-5222 he can fix you up with what you need , you'll need the output shaft and yoke and the extension housing and you can put it in any C6
Frank