440ci R3 MOPAR Small Block on Dyno! How Much Power???

Finally got the 440ci R3 rebuilt and on the dyno. She made 644hp @ 6700rpm and 576 ft-lbs @ 5100rpm. This was with an untuned, out of the box Holley 750.

440 CI R3 Siamese bore small block
Worked over Indy 360-1 heads
Indy 360-3 intake
Forged Diamond pistons 10.8 comp
Eagle H beams
Eagle forged crank,
Comp solid roller cam 256/264 @ .050, .648 lift on a 110 LSA
Comp solid roller lifters (bushing)
Harland Sharp 1.6 roller rockers
Smith Bros 3/8” push rods
Melling HV pump.

Special thanks to Chuck at KTRE and Max at R&R Performance.