Join Date: Mar 2010
Location: Wentzville, Mo.
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If you want a four speed I would recommend a Muncie M-20. Still pretty plentiful and you should be able to procure a servicable gearbox in the $300 - $600 range. I would also recommend getting a factory service manual or the excellent GTO restoration guide by Paul Zazarine for diagrams of all the components.
Aside from the gearbox you will need - A flywheel (factory are cast iron which is fine for stock but you might want to consider steel if your budget allows), a bellhousing ( Pontiac, Olds, and Buick used a specific one, different from Chevrolet. Stock is cast aluminum, aftermarket is steel), clutch and pressure plate (lots of aftermarket support here), throw out bearing, and you'll need a clutch pedal and linkage as well as a different brake pedal (Manual are narrower).
Sticks are a lot more fun to drive if installed right.
If you are interested in an overdrive, I highly recommend the Tremec five speed. That is all dependant on your driving needs, your rear gear and your budget.