It should be pretty straight forward swap and with a little searching I am sure somebody has reference numbers as to WHERE TO CUT THE FLOOR. Also note WHICH flywheel you NEED? 2.75 or 2.5. Your's SHOULD be 2.75 but always worth checking BEFORE you go getting a flywheel.
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2.75 or 2.5? What is this wizardry you speak of? I thought a Pontiac flywheel was a Pontiac flywheel?