Another vote here for getting another car while you work on your project. If you had a lot of experience in doing these kind of engine swaps, you would know that they're not done quickly. And you're trying to put in an engine and transmission that were not designed to fit in that car, so you're going to have to do a lot of research and experimentation in order to get all that to work. It's possible, but not necessarily easy or quick OR cheap.
I'm not trying to discourage you. Just trying to point out that this is a MUCH bigger and more expensive project than you think it's going to be.
Unless you have that 85 302 already, I would highly suggest that you get a 94-95 302 and AODE transmission. The swap will then be much easier, as you will be able to re-use many things from the V6. It would be even better if you can find a wrecked 94-95 GT rather than just an engine, because there are a lot of brackets and small parts that will be on the wrecked chassis that will be very hard to find otherwise.
I do have some experience with that kind if swap; I dropped a 95 Cobra engine and transmission into a 94 V6 body. This was my first engine swap project, and I had a wrecked Cobra to pull parts from, and it still took me months to get the project done. There were so many things I didn't know that I didn't know - new tools to buy, for one. In my case, I had a decent-paying job where money wasn't much of an issue. You don't have that luxury.