Tech may be right on this, but i'm not so sure (and it's unusual for us to disagree ). He may be right especially as it applies to the runner volume.

I've used these manifolds on a 65 Biscayne and a 53 Chevy both with 350s (the Biscayne had a 4 spd and 3.08 gears and the 53 had a TH350 and 3.36s). The both were running a cam that specs out about the same as what your running and 1.94 heads. The major difference was I ran 500 CFM AFBs with progressive linkage instead of Hollys.

Prior to using the first one on the 65 Chevy I had the same concerns about the manifold that Tech has, but figured what the heck and tried it anyway. Both cars ran great with more than sufficent bottom end torque and decent gas milage.

I think I would put it on dial it in and see how you like it. If it dosn't work out then it's time to make the decision on wether you want to change heads or intake to something else.