First you'll need to obtain a straight drive. They come in two basic flavors; one-piece or two-piece.
The one-piece is less expensive but offers less flexibility in your setup. The two-piece offers more adjustment for motor plates or adapter plates.
The transmission will need a valve body that will allow normal operation without the slippage of the conveter. There are a couple of units on the market now expressly for this purpose.
I am currently finishing development on a new version circle track valve body that will eliminate all external line-pressure controls. It'll be really easy to set up and drive and worked well on a few race cars late this season.
Nothing trick required in the transmission itself. It'll merely require a decent rebuild with good frictions. Even stock input shafts and 1.82 gear-sets live in these things which keeps costs down.