410'

FYI, the old saying "Gears make um Go" For a experiment I took the 4.30's out of my drag car and installed a set of 3.73's and lost 3 tenths.
X4 on the heads,, go with aftermarket.
We did a similar 415 inch engine with a flat tappet in a 76 Aspen and ran 10.90's with 4.56's.