'91 360 for my '73 Swinger?

Should have a roller cam in addition to the 308's. Great engine, should be pretty strong. Keep in mind you'll need a car oil pan and pickup and a new engine mount for the 360.

With 80k miles I'd want to hear it run and see some compression numbers if possible. $300 is a great price, but if you want to drop it in and go I'd want to know that stuff. With 80k you might want to throw a new timing chain on it before you toss it in, especially since you have to drop the pan already.

For reference, I just dropped a '86 truck 318 with 85k into my Duster. I paid $250 for mine. I changed the pan an pickup and installed a new timing chain, which it definitely needed. Unfortunately, I didn't get a chance to see it run, and it turns out the valve seals and guides are toast. Compression numbers are great, but it smokes because of the seals and guides. So, things to look for.