Re: Saginaw 3 speed
GM started using the Saginaw 3 spd in 1968, earlier likely had a very weak non-synchro low trans.
The basic Pontiac trans should be the same as the trucks, however, the trucks started using a 5 1/8 front bearing retainer where it fits the bellhousing in 1968, while the cars stayed with the earlier 4 11/16 size hole, so you may need to swap the front bearing retainer, (with a new gasket and seal) to match the bellhousing hole.
Also, the truck trannys had threaded bolt holes for the bottom 2 bolts, cars just have holes, so you will need a bolt and nut inside the bellhousing to secure the bottom of the trans.
Unless GM did something with the trans length or output shaft spline count, it should work.
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