Am i crazy or am i on to something here?

I have a 66 barracuda that I am restoring. My wife is not real healthy (diabetes) and funds are getting hard to come by for the project. I am down to rebuilding 4 speed and motor. I am a carpenter and am working on some side jobs for the tranny rebuild. I have a 68 340 I bought 2 years ago I was going to build and put into it but I don't think I will be able to afford it now. Here's where I need help. I think I can sell 340 and buy a 318 or 360 in possible good running condition with the money from 340 sell? Or trade someone their good running small block for the 340. 340 (complete) was running when pulled but was real tired (what I was told from guy I bought it from) I was going to build a real killer but things in life change. I would be happy to just get car running now. Opinions on best path? I am an adult, be free to be brutally honest if need be. If I am crazy please tell me as I don't want to sell 340 then not be able to buy something to replace it with. Thanks for taking the time to read long blog.