Stroker motor are over rated..... Yes it is nice to say I have one. But why? Build your 400 or 455. Do what needs done. If parts need to be replaced then replace it. If you don't mind the price of race fuel put which heads you already have on the motor. Make sure your valve springs can handle the cam you want. I went with a Crower cam that eats the tires off my car. It's a 428 30over with KB forged pistons, 62 heads with Ferrara stainless valves,comp cams triple valve springs, Harland sharp 1.5 roller rockers, had crank turned 10/10, rods reconditioned, hot tanked, magged, new bearings,1968 428 quadrajet, dougs headers backed with a richmond super t10. It's the baddest motor I have ever owned period.... I have owned some fast cars too. Or maybe I am getting old...