I am putting a small block chevy engine in with the factory 4spd. I am using the Mark's V8 kit. The instructions that came with the kit show a Centerforce clutch kit which is a little pricey compared to a LUK which I have used plenty of and never had a problem. I wanted to know if anyone else using this kit has had any luck with another cluch kit. If the Centerforce is the only one that works, I will get it but I don't want to have to pay big $$$ if it is not absolutely required for proper operation. PS, I did a search for " Marks clutch" and it wasn't much help. Thanks, I couldnt complete my build without this forum and everyones help!