Oh man it's been a while and I'm bad at explaining transmission stuff without it physically in front of me. I thought the +/- markings are for the adjustment process if I remember correctly. They alter the alignment left or right.

I'd try and drill it and re-thread since the transmissions are a known weak point. There's a lot of rotational force on the transmission and trap door already and I wouldn't want to risk it leaving 1 of 4 out.

I would try and straighten it out for sure. Ironhead transmissions are definitely not the strongest design by any means. I've had a few with blown up cases or exploded gears. I'd try and drill out the old one and re-thread or helicoil so you know the fastener is grabbing proper. Good luck!

If it were me I'd replace it, only because their 1) not that hard to swap, 2) not crazy expensive, and 3) I'd rather have a fresh one in there as the whole shaft relies on the two points of contact. I don't know how important it is since the primary/trans share fluid so I think it should be okay, but don't quote me on it. Good luck with the build and thanks for watchin!

I hear that. This case was welded in about 8 places from a buddy that I trade work with regularly.