How hard could it be to sell a 318?

I've been trying to sell a Jeep 4.0 with HO heads for a long time. What's really crazy is the offers have actually gone UP! I've had a buyer at $75, $85, $100 and now $125. Called the guy three times and haven't heard back/doesn't answer my PM's (different site than this). Getting to the point where I'll probably just store it. Love to trade it for a small block Chrysler...