What engine should I use?

What engine should I use?

Thanks for the input. I can get internal engine parts at wholesale and my good friend owns a cylinder head shop. That will save some money. I'm thinking of selling the 72' 340 block bare but don't know what to ask for it. It's been checked, bored 40 over line honed and I think I have the cam bearing installed (Not positive!). I would be happy to get what I paid for the machine work for it.
Thanks again!
Brian