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You should get what you want pretty easily.
Consider strongly the 5.3 with aluminum heads and aluminum block - slightly less ultimate horsepower potential then the iron block but lighter by a bunch.
Hotrod magazine had a writeup where they took a bonestock junkyard 5.3, added dual exhaust, cold air intake, camshaft, custom tune from EFI live to richen WOT and valve springs developed over 400 horsepower. Granted, they were spinning it to 7000 rpm, but the 5.3's LOVE to spin.
Now combine that with your pretty small (narrow) 944, strip some weight, and you are pretty much there.
The next trick is to keep the mileage up. A bone stock 2005 corvette, with 6.0 gets 25mpg according to the epa. The corvette is a BIG car. 3300 pounds. CD .30 or so. big frontal area of 22.3 square feet.
944 is 2800 pounds, cd of .35, 19.5 square feet.
Should get better mileage.
Pretty cool conversion.
Camshaft is 100 bucks, valve springs is 120 bucks. In theory you don't have to pop the heads to change the cam, but I probably would - you have to pull the intake off anyway.
When you pull the intake, check out the intake ports. If you know much about porting or heads, the ls3 engines are MAGNIFICIANT!!!!!!!!!!!!!
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