When I first bought my used W2 heads there wasn`t much done to them, my combo at the time was; 340 Block 12 1/2 to 1 compression. heavy TRW domed pistons, 627 lift roller cam, Strip dominator, 750 HP carb, 1 7/8 headers, made 527 on the dyno, went 10.70s in my Dart shifting at 7,500 : later put those heads on a 30 over 360 crate short block with a 590 lift mech. cam, with cast crank and stock rods 11 1/2 to 1 compression . Victor W2 intake went 10.70s also and made about 530 hp, after a spun bearing I went to a M/P forged crank with eagle rods and JE pistons still 590 lift cam, same heads, and still 11 1/2 to 1 made 549 hp 450 tq and went a best of 10.40 shifting at 7,000 I put over 900 runs on the motor and it still ran great. I just recently took it out and went to an R bock, 408 c i ,Indy 360-1 head, 600 lift mech cam, 950 hp carb , Indy 360-1 intake, same 1 7/8 headers, 9 1/2 to 1 pump gas motor. that has gone 10.70s lifting at the stripe. ( too much gear and rpms) I have since put 4.10s to replace the 4.88s it should go 10.50s but will be throttle stopped down to run 11.50s