340 HP's vs headers

Yep they were sloppy as heck back then. About half the problem is the way overboosted assist. Dial the line pressure down a bit and it tightens up. I think in a mopar action article they said its about 1,600 psi stock, and dialing it down to about 850 psi. tightens it up. Not 100% on the numbers though. Find the article on the net, and check it out.