Sean Hyland motorsport did a 5.0 swap into a focus on one of those car shows last year, and there was EXTENSIVE fabrication involved. Beware.
craigslist.com is a local classified web site - here there a couple 302's currently listed.
By "how fast you want to get your car running?" I meant how SOON do you need to repair it. If you have lots of time you need less money.
That brings you to the budget - I guess without you posting what you want to spend, it's pretty hard to say, but if you want to run 12.5 you will need at least couple grand for aftermarket heads, cam, intake, and rear gears. Might want to stiffen your chassis, too. This is all after you get your shortblock put back together.
Welcome to stangnet...