I went through a close ratio trans like that back in 2010. It was a 1973. My gears were a lot nicer than that and it would crunch doing a powershift into 3rd before I took it out of the car.

Gears are actually more expensive for that trans than the early wide ratio trans of the muscle era.

I got a couple decent used and new gears from "Paul" at Liberty Gears. A very nice guy to deal with.

You might be able to polish/deburr that shift fork and reuse it. There are some shops, I've heard, that will plate forks to tighen up clearances. Probably not cheap.

Converting to the earlier style forks/cover is probably a better idea, as mentioned.