how much cfm in a carb should I be looking for?

Ok , lets use your own formula.....he said 360 stroker so probably 4 inch arm so say 408 cu in.....say max RPM he wants is 7000 / 3456 = 826.39 Seems to me 850 is right on the money...not too big even using your own formula...and you say add 25% for race application is another 206 cfm is 1026CFM for a 408 stroker whats up with that? So a 1050 Dominator you are saying should be OK for his 408 twisting 7000 RPM in a race application and wait, he only has 450 horsepower? You said it was too much for a 525 HP engine

A 450 hp 408 stroker wont see 7000 unless it's completely over rev'd.

Peak is going to be somewhere between 5800 and 6200.