In the matter of torque production: Since we're discussing Cleve/lands/ors, I've attached the final pull of our prototype 460 Clevor.
Now I know we're discussing engines 120+ inches smaller-so I'm not comparing outright max torque figures. I only wish to show that torque production with these parts is reasonably flat (and substantial) from 3500 (lowest we pull) to 5700 RPM with a gentle peak between 4200 and 4400. Yes - the 4.25 crank is a major contributor here.
Here's a pull of our 8.2 deck World Man O'War
Windsor (no CHI parts) 371 which shows a small torque drop between 3900 and 4400 RPM, then goes on to pull comfortably over 400 lbft. to 6200. But even this is making 400 lbft. at 3500. This is a 4.125 x 3.470 combination and produces 1.27 HP/CI. Excellent for 2400-2600lb cars.
Quote by MikeD:"
I've been told by several engine builders that the 302/347 combo will easily pump out 550-570hp".
At 1.6 HP/CI that's certainly possible (but not easy IMHO) but in N/A,track only race-gas form- that's a very snotty combination to live with. And there's a torque deficit because you'd need big RPM to get there.