Dang I've had a 413 sitting in the shed that I pickled so it wouldn't freeze up. I don't have the intake or carburetor set up, but I'd be willing to sell it for 1/2 that price and laugh all the way to the bank.
Is the money in the intake, carbs and air cleaners? Probably the heads too. I'm sure the 413 truck block is worthless but the top end must be worth some dough.