4 speed conversion setup

What engine? Bell housings are different for /6, small block and big block.

Brewers Performance has "kits" but not cheap. You could probably truck on down to the Mopar Nats in Columbus and piece together most of what you need. Or Carlisle.
You most likely should buy a new clutch.
340 engine. I'm hoping to find someone with a complete setup. I can see collecting parts here and there getting to be a disaster.