TTI header woes
Still an old thread, even with the May 2023 posts, but my TTI headers also hit the proportioning valve (or combination valve, or whatever you call it) in my 65 Barracuda 340. I just moved the valve back a couple of inches or however much it took to get it out of the way. Had to fabricate new M/C lines anyway, and it was easy enough to also shorten the front/rear line and put a double flare in it. Very simple procedure compared to swapping in a late Hemi.
I don't know how much variance there is in later A bodies, but I can tell you the valve in my 65 Barracuda was originally mounted 2-3 inches ahead of the valve in my 63 Valiant, even though they are the same basic chassis. I can't fault TTI for failing to accommodate every conceivable production variation.