so i just got a 71 k10 a couple weeks ago. plan on puttin the zz383 crate motor in it and im wantin to keep it 4 speed. right now it has the muncie m21 i believe and was wondering if the trans would hold the pwer of it. i know im gonna have to get a heavy duty/performance clutch but will the transmission itself hold? any suggestions otherwise would be nice.....long time no see btw