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Timing.... Get it dead on and tighten the belt while it's cold, roll it around two times and check it again. It will most likely run the best for many different reasons when cold, one is timing- the absence of belt stretch when cold, two is fuel temp, and three is air intake temp.
I've noticed my performance slacking when the belts are loose. It runs like a gorilla with burnt nuts after a belt change/tension though.
What is the condition of the head? Any bent valves?
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83 944
91 FJ80
84 Ram Charger (now gone)
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