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Well, from what I've gathered :
The 9.8:1 euro 3.0's from '81-'83 had K-basic CIS with a special fuel distributor which flows more fuel. If your '83 is a US model, you'd have to dump the frequency valve, and go with the euro '81-'83 F.D. and a vacuum controlled WUR. Deceleration valve is like the USA pre-'80 and the euro's have a thermovalve.
The intake ports are the same 34mm as your '83. Not the wider 39mm as on the earlier 3.0's. I don't know about the throttle body size.
Camshafts are the same, but are timed more retarded than the US '83.
I read here or on Rennlist that the ignition distributor had a special advance curve and only advanced to 25* total. I don't know any more specifics on that. They only had vacuum advance, but not vacuum retard like the post-'79 US models.
They also had smog pumps, but I doubt you'd want to add one of those.
Rob
1980SC Euro <--- nothing special. Only 8.6:1 compression
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