Cars never received any of the overdrive, just truck.

All overdrives used the small block bellhousings except the diesel and they had a unique bellhousing which only fit the diesel and V-10. Some people continue to say they are a big block bell but that is incorrect. The diesel and V-10 received 12-3/4" converters and had a radiuesd shaped cutout at the bottom of the bell.

To fit a big block you need an adapter or have someone transplant a big block bell to your trans.

Overdrives based on the light duty 904/998/999 are called A500.
Overdrives based on the 727 are called either A518/618.

All the overdrives units look very similar to each other but those used behind diesels received a different spline angle for a few model years (so be careful mixing parts up) and some used single sided overdrive clutch discs (we eventually went back to dual sided).

Each family was first released as non-lockup then eventually made in to lockup.