I will bet the 273 xh. man. will be the ticket. We know the 340 ones will be plenty high $$. If going on a pretty much stock SB, I bet their will be fine for a driver car. Like said, in an early A and a stick all the room there you can find is needed.
You could try the 72-4 manifolds. Not quite as smooth as the early ones and smaller outlet by a quarter inch but they do flow better than the early ones do.
