Usually that would be what i would expect, but would like some input. Going from 528 to 560 cubes, same fully ported 440-1 heads, same cam of 285/296/114, same 15/1 compression, same 3X intake , alky, same headers. I figure maybe 200 to 300 rpm lower shift points?
I have just bought 4.30 gears to replace the 4.56 i have now. The motor was spinning 7300 in the traps the last run at 150.5 mph. I hope to pick up a couple of mph from the change to 560 cubes.