Late A headers on an early A (smallblock)
I think there was a thread a few years back about somebody using typical 1 5/8" 67-up headers in and early A. If I remember right, the left side hit pretty much everything and the right side hit the steering. The short of it was, yes, with enough bashing, bending and tweaking they can be made to work. And, if your time is worth anything, try something else...