I built a 440 with Victor heads & .660 lift roller cam , it dynoed at 702 gross HP & 630 ft lbs , I broke it in with a carb & it was choppy at idle , we then switch it to multiport EFI I was 100% different , it idled like a stock engine as every cylinder would fire , completely drivable in traffic & ran high 11s with street tires at the local track