First thing I would suggest is to clean up the heads and have them magnafluxed to check for cracks. Remove the valves and check for cracks in the seats. If that checks out, check for a straight deck. There are so many variables that can't be seen until you have a machine shop inspect the engine.
Why spend your hard earned money on gaskets when you can buy some assurance from the machinist that you can use the engine.
If you're on a time line,it's gonna cost you any way you go, so let your conscience be your guide