Looking for more 408 pull at the big end?

Head( if its any good) is enough to go 130 mph in an A body. Its too small for sure, but it will support 550 horse falling off a log on the right shortblock.
I am not much( at all) of a Hughes fan. But if the head is any better at all than stock i would guess most of the problem is the convertor. Its definately hurting that combo
Should run high 90’s in the 1/8, 122 or so in the 1/4