Chris
If it doesn't run take it back where you found it.
I have a complete 73 Buick 350 engine that runs good and I haven't been able to sell it for $100. It would be cheaper to drive to Maine and buy my engine. From your post I get the feeling that you have no use for a Buick engine anyway. Buy a 350 Chevy if you want to build up an engine. That way you'll have something of value to show for all your hard work. It's easy to sell a rebuilt Chevy engine at a profit. There's not much demand for a rebuilt Buick.
I would love to get rid of my Buick 350. It's taking up valuable space in my garage. If $100 is too much I'll take the best offer.