Cutouts for Strip only, beneficial?

I don’t know why your cam profile is so the way it is but with that many cubes and stroke I would have gone with something around.250 @ 50
110 CL and then close to.600 lift. I’d say you are giving up fifty hp with that cam.
What guys don’t realize when building a long stroke is that what a 383 likes needs to have ten more degrees of duration for a 440 and then the same thing is true for 4.15 or 4.25 stroke engines, add ten more degrees of duration in comparison to the 440 and 20 compared with a 383.
So if a good street cam for a 383” has 230 @ 050 so a 500”+ needs 250 @ 050 and will make 500tq @ 2500rpm.
Another mistake I see made with the big blocks is using a two plane intake, if you have a 4.15 or 4.25 crank you don’t need to worry about low end power only traction. A two plane will kill top end and bottom end on a big inch engine.