RE: 4 speed question again.....
If what you have is a correct E body 3 speed, Your should just need the bell.
The flywheel, clutch and pressure plate are all mated to the engine and should have 23 splines.
The four speed bell will have a slightly larger hole for the bearing cover of the trans and it won't change the clutch linkage.
Obviously, you'll need another shifter, preferably Pistol Grip.
The drive shaft should also be fine.
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