I've got a bushmaster V-match for $750.
I think you're going to have a hard time trading that motor. Car guys would be the only ones remotely interested in it, and they all pretty much know that you can get a good running 305 for under $250 on ebay or out of a parts vehicle. I just sold a 305 w/ new Q-jet, edelbrock intake, pointsless ignition, that was a runner for $275 and that's with all the aftermarket parts.
Your best bet is to save your money or take out a loan and buy something that is good and what you want, otherwise you will never be happy with what you've got.