Waste of money--but probably not available anyway.
You can get anything you want for a 2-speed Powerglide. Since the Pontiac 2-speed is actually a TH 300, NOT a Powerglide, aftermarket performance parts are...limited.
Might want to look into using the switch-pitch version of the 300, or better yet, just stuff in an overdrive--a 200R-4 or 7004-R. The 200 will bolt up to a Pontiac engine, the 700 will need an adaptor plate.
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