engine/ transmission on a budget advice.

[j.rigby15r]

So here is were I'm at, if you haven't read any of my previous posts. I have a 64 c10 that came with a sbc 305 that has a cracked head. I have a th350. My plans are to pull the 305 and either drop a 327 or a 350 in. I've recently been thinking about putting in a different trans. If I do that what would be the best way to go I.e th400 700r or what? I don't have a lot of money to do this and am ok with rebuilding something. What would give me both decent power as well as good economy? Any ideas or suggestions are welcome as I am open to anything right now. I am wanting a cruiser that has some power, this will be a daily driver.