Capt. Jimbo McSubipants

ok..i have a z6 with a blown headgasket that i need to fix...once thats fixed...i'm going to boost it again....i searched and came up with that OEM is best....but what year...obd1 being composite...obd2 being metal type....so i'm assuming buy the metal once...but will it work on the Z6...i'm assuming yes...