can anyone tell me why someone would run a 350 head gasket on a 305? My first thought was to lower compression, and I never heared it run. I have used a set of 350 heads on a 305 and it ran good,still running. The heads are 14022801 1.85/1.5 valves / 58 cc More info is that they came off of a 1980 - to I think 1986 305. Does anyone know what the comp.ratio would be if ,[and does], have dished pistons,no valve reliefs.