Engine replacement

Do you just want to do an el-cheapo basic rebuild (rings, bearings) or do you want to build this thing to take a little bit of power (IE: Rods, Pistons, Crank, etc)?

If basic is what you're after, you're pretty much a tie between what it's going to cost you to rip this thing apart, buy/borrow the tools necessary and spring for the new parts or get yourself a used donor engine. I'd look around for a '99-up PI engine for your car to make a little power in the process if the engine swap route is what you're going for.