I've got a friend who's putting in a late model 302 with his rebuilt C4. he was telling me he's not sure what to do because he needs a flywheel with a 50 oz. imbalance, and yet it needs to fit his C4. Anyone know what he needs to do?

I'm not really knowledgeable about what he's doing, but I'll try to help best I can.

 

what he really needs is a flexplate with a 50oz BF it seems it should just bolt right on to me.

 

Try here but make sure he needs 157 tooth and not the 164 tooth they also have them.
http://store.summitracing.com

 

If the 302 had an AOD then it would have had a 164 tooth flexplate. Just get a 157 flexplate 50 oz and he should be OK. They all have the same converter pattern.