Opinions on motor buy

[HawkX66]

I have a local guy that has a 72 truck 402 that has a decent cam installed. Is $500 too much? I've talked him down quite a bit. I've been just looking for a motor to run temporarily while I figure out what to do on a more permanent basis. I hate buying engines that I can't hear run from people I don't know... He sent me a video of it running before he pulled it, but that doesn't mean much to me. It seems like big blocks are gold these days. I'm having a tough time finding anything other than bare blocks for reasonable money.