The NA (L36) engine is 9.4:1 compression and the SC (L67) is 8.8:1If you are going through all the trouble of supercharging your engine, I would make sure the engine is built for it. You may just want to see if you can pull one from a junk yard that is already supercharged and have it rebuilt or buy a donor car with the supercharged engine in it with the ECU and wiring harness.
That's about the exact price range to come out of it with a ~300-350 wheel hp build with smart shopping. After having a blast getting my '98 GTP going with an L36 with the X-P cam, headers, and stock heads/LIM with the Gen 3 & later GenV... I did about 6-10 other builds for L36 folks in MI, MN, and NY with nearly identical work. My setup got to 333whp on 100/104 Sunoco unleaded, and [email protected] spinning street tires at Norwalk in 2006.Don’t believe anyone that says you can do a top swap for less than $1500-$2000 though, way more to it, to do it right.