lol
jasper if i didnt already have an 1987 stang lined up with a 351 in it i would be all over your ****.

 

USMC a well built C-4 can handle as much as 1000hp, I have heard reports of more. But basically you can keep from killing them, and there are a ton of folks out there who can build them right. If you are looking to go past 1000hp then Powerglides would be a logical step