1Gary,what heads were you using?and combustion chambers?
what stroke was the 383?Thats a big spread of HP and torque.The hp looks correct and Ive used that intake a couple times with great success. I was looking for slightly more HP via a slightly bigger cam,perhaps put in 2 degrees early.and wasnt expecting quite that much torque,but that chart looks fantastic.
was it 3.8 stroke ??