ok the zc is down in my gold 90 and i am geting my wifes old 91 ef std hb(whitey). whitey is a slow piece of ---- and im a lazy ----. both the cars have a little white puff and low compression indicating blown head gaskets. if i am going to build a engine i am going to build the zc. should i swap over to mpfi, pre zc overhual. or would the increased extreams of more air more fuel more HEAT. including a higher redline wear out a already wornout head gasket. and leave me stranded with a pile of ----!