HEY MICHAEL HERE IS A LITTLE CHART THAT MAY HELP THE GUYS ON WHICH YEARS THE CYL HEADS WERE USED ON WHAT ENG

AMIEGO========9/88--8/92 ALL OF THESE HAD THE SAME CYL
PICKUP======= 88---9/92 HD WITH THE LARGE COMB CHAMBER
RODEO==========91---10/92 AND AIR INJ PIPES
TROOPER========8/87-9/91 NEW PT NO 290340800


AMIEGO========9/92---94 SMALL COMB, CHAMBER, WITH
PICKUP========10/92-11/95 AIR PIPES
RODEO=========11/92-8-94 PT NO 290340-8100

PICKUP========8/94--11/95
FEDERAL VERSION SMALL COMB CHAMBER
RODEO=========9/94---97 NO AIR PIPES
PT NO 290340 8200
HOPE THIS HELPS SOME JERRY