the V8s used a diff drive train.The drive shaft is larger and the diff has 4 pinion gears.The transaxle I wanted to put in is a special 4 speed auto with a clutch that were made for the 421 SD tempests.The stock 326 V8 drive train with the auto is quite strong.No problem running a bigger CI engine with street tires.The 3 speed wont handle any more than the 326HO.If you want to run the auto you will need your crankshaft drilled and taped for the rope shaft.Tom
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