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Going through this myself. It all depends on a bunch of factors.
#1 - If P's & C's are good the cheapest solution would bee to keep them. This will then change the cam and ignition options drastically.
#2 - If the P's & C's can be changed then you can go to a 3.4 or 3.5, change compression ratio, modify heads for twin-plug, change the ignition, and change to carbs.
#3 - Upgrade to a 3.6
My estimate doing it yourself puts options #1 around $5-6k. Option #2 can run to $15k. Option #3 can run $10k+ and youo still have a used un-rebuilt motor.
The real question is what do you want in terms of performance and what are you willing to spend? Good luck.
John
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1985.5 944 GTS
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