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In 80-83 ROW cars also had higher compression pistons. One reason for the larger intake and different fuel distributors.
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So did US cars.
'80-'83 US 9.3:1
'80 RoW 8.6:1
'81-'83 RoW 9.8:1
If you were building a 3.0 CIS motor, you'd want to mimic the 204 hp 930/10 RoW (big port heads, 9.8:1 CR, RoW CIS and ignition distributor)