^^^^ max-wedge size ports vs standard ports will flow ~30 to 50 cfm more out of the box.
that's a lot; requires intake to match & headers, if you get the biggie size
you wanna aim for 9.5:1 / 10:1 or so compression ratio for pump gas. i think the 440source kits list the ratios, you could even use a 400 block to get 512 c.i. and they are stronger blocks than the 440's if you are using a stock block