It's either an MP or a Milodon gear & shaft assembly; I bought one of each and don't recall at the moment which one I installed. I also bought a 440 Source bronze gear & shaft, but something about the teeth on that gear looked "different" than the other two, so it's still sitting unused in parts box.

Cam button = Yes; it's one of AndyF's rollerized buttons along w/ his timing cover

End play = .008", IIRC (tried a few different cover gaskets to get it w/in recommended range)

Also have a collar on the distributor shaft to keep the gear assembly from lifting up (.015" free play, IIRC)

Might get a chance to get pics tonight; otherwise, maybe late tomorrow.

Thanks - Brad