got my 85 gt back on the road a couple weeks ago ,mods are 40ps milled .040 ported polished ccd,mac shortys,bbk x,670 street avenger,edelbrock performer,stock cam,flows,410s,bm shifter.i bought a stock replacement 10" clutch.if you launch at 2500 and shift at 5000 it slips like hell!!!!!!only slips in 3rd,that i can tell,it roasts tires hard until 3rd.any help would be appreciated.today i picked up a flywheel from a 88,should i upgrade to that while i am replacing??