440-1 flow numbers

I went from some great 440-1 heads to 571-13, 385cnc, 2.30 intakes, same intake, slightly better headers but went from an iron mega
Block to a BMP aluminum, both combos 549 cubes, methanol injected . 15.25 compression. 440-1 heads, 926 hp ar 7100.
572-13 heads, 982 hp at 7600 rpm.
I used. 043 rings on the -1 xombo, .9 mm rings on the 572-13 combo. Same cam. Same dyno