Before you buy any engine you should always turn it over a few times. If it does you're off to a good start. Since you already bought it might as well check. What size it is. Its obviously a small block. like many said; check the casting #'s. Looking at it could either be a 5.7 or a 5.0. Since your planning to Freshen it up. Id look for obvious damages. Lifter wear/Cam wear, or any pushrods bent? Look for scoring on the cylinder walls. You know the obvious. If you plan on doing a cheap "rebuild" I'd recommend this parts list. Whether it be a 305 or a 350 its up to you if you want to rebuild it. 350's are preferable but, have no shame in a 305. You can get some decent TQ out of them. If you want to run the trans, buy a lock up kit.
Federal Mogul Premium Engine Rebuild Kits(350)
MK6038A-000
COMP cams kit (good for 350)
K12-234-2
Federal Mogul Premium Engine Rebuild Kits (305)
2056026M-000
Lunati (good for 305)
10120100LK
Buy a separate timing chain...
Classic Performer RPM
7101
And the Oh so famous 1406 Carb