hi. i have a 331 stroker that was built by an AWESOME engine builder in chicago. i know for sure that he balanced the crank by itself... i have an aluminum fidanza flywheel. he told me to add 28 oz weight to the flywheel and marked the spot. i did that. i ran the car a while then it sat for two years... i got it running again the other day.. now i have a HORRIBLE vibration at high rpm in all gears, even in neutral with the cltch pushed in. based on what i have read online when the crank is balanced seperate you add a zero offset balancer and flywheel... so now im confused. should i have added weight to the flyhweel or not? and what kind of balancer do i need o buy? zero offset, 28 offset or 50? i know this vibration has to go or it will tear up my expensive engine. i really really need some help with this.. hope you guys can help out