One of the most important issues you will have with installing any overdrive trans is with the carb linkage. The overdrives use a cable that controls both the shift points and pump output. One of the design features of these transmissions was to allow variable pump pressure to depend on throttle input and not just RPM. Most Pontiac carbs do not readily convert to the correct ratio between the carb and trans cables. Late model Q-Jets (mostly Chevys) had throttle linkages with the proper geometry. The aftermarket kits to convert Q-jets to this geometry do not typically work on Pontiac linkages. The throttle linkage on my 1970 carb is bolted to a throttle plate flange. I just took off the stock external linkage and bolted up one that I robbed from a late model boneyard piece. Unless you obtain the correct relationship the shift points and pump pressures will not be correct ... this can cause extremely harsh shifts or premature clutch pack wear. It's not too difficult to achieve, but if not done properly it can be an expensive mistake.
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