The Dak/Mag cable has a square end on the firewall end, and it's easy enough to make that work. I did that on my Valiant, but the cable locating hole is in the pedal assembly. I'm not sure how the 65 B-body setup looks though. I don't think you can rotate the TB on the manifold at all due to the IAC air passage, but I haven't played with a stock Maggie TB in a long time, either.

Clair