904 Transmission rebuild

Hello everyone,

I am in need of some answers. I am doing a 318 swap into my car from a 273. The new motor is a beefed up a bit but nothing crazy at all. So the thing is, I want to go through the transmission and give it so it can stand up to some future upgrades to the motor.
So the question is, what do i need to do? I am just ignoring the 727 stuff because, finding one local is hard as hell and I am just going to go with what I got at the moment.

So any pointers at what good upgrade options would be awesome.

Thank you!