92 and newer carbs will have a stamp on the side WMH carbs.
16's are 200hp carbs :)
wmh - 12 and 13 are 2.0L motors
wmh - 14, 15, 16's are 2.5L motors
Old style wh- carbs . . . the stamp is on the top . . . 1990 and earlier.
wh-20 were the fastest . . . I have 2 sets off 2.4L v225's ;)
wh-22's are the second best 200hp carbs.
Diamond shaped heads are pre-83 motors . . . head bolts on the cylinder walls . . . no oil injection.