what are the differences in the b16a2 head and the b16a3 head? i know the b16a3 head is obd1 and the b16a2 head is obd2b... i can get a b16a2 shortblock for a very good price and if i could just slap a b16a3 head onto the b16a2 bottom end that, i could get my car (94 ls) up and running again. are both heads the same size? need to know which timing belt and head gasket to use... im sure it is plug and play if i get the del sol ecu. basically it would be a obd1 b16a2??