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Probably jack at Gtek. East Toronto, knows the 964 well, builds a mean 3.6 motor. It's a busy shop mostly filled with air cooled p cars. Not everyone loves them. Detailed instructions and close attention to getting what you need/want will help.
If you can go north franzl at auto select. Unsurpassed, farther away.
After four years of wrenching on mine, happy to hElp look at one with you if that's helpful.
GTek did the PPI on my 964 and services it for me.
Previous owner took it to Competition Motors in Belleville - they did a lot of major work in the car there.