What RPM do you trap at currently? Are the RPM heads stock port size? If everything stays the same but use a 500 CI short block the HP RPM peak will be much lower than your old 440. Same with the 470, just not as pronounced.
My 470 with stock port RPM heads and a .550 lift cam makes peak HP at 5400.
My 470 with slightly bigger than stock ports and a .680 .660 276 281 @ .050 Isky solid roller was still makin power at 6900 on a chassis dyno and pulls real hard on the street and track. And that's with a 40 year old cut down 413 forged crank.......
