Re: Just need some advice..
I think your living situation is going to dictate what the next step ought to be. The reason I say that is because I do most of my wrenching late in the evening after the kids go to bed, and since that means I'm working with shorter chunks of time, I often leave all my tools and my mess sitting there and I clean it all up whenever I get the next chunk of time (could be a couple days or more). The point being, I couldn't just leave all my crap sitting outside so in my case I couldn't do it without a garage. Where you live obviously makes a big difference too, couldn't imagine wrenching outside in January here in MI but if you live in Arizona in might not be much of a concern.
Also, how easy would it be to get your car in a garage? Would you have to move? Do you have space to build one? Do you rent your house or do you own? You don't have to actually answer, just giving you something to think about.
Anyways, I'd probably prioritize getting the car running and driving first. You'd be surprised how easy it is to forget about swapping engines and transmissions for a while once you have a good running car, regardless of what's under the hood. Then focus on getting a garage to work in, whether that means building one or moving or whatever. When you're ready to swap in a big block and a different transmission, it will be easier and much more enjoyable working in a garage.
'66 SS Clone
Fast Burn 385hp Crate 350 (for now)
Muncie M20 & 3.42 Posi
UMI Stage 2 Suspension all around