How easy to get 500 horsepower w/ stock stroke 440?

10.5:1
242/528/112 cam
ported RPM Heads
1:6 rockers
RPm intake
950 HP carb
HVH Super sucker spacer
2" or 2.125 headers

500hp/547tq

Unsure of vacuum at idle but the idle was very mild and would idle down to 600 if you wanted it to.