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I have a 2bbl 307 sitting in my blazer. Strong running engine but a wimp nonetheless. I wouldn't waste my time building either if I wanted decent power. 350's are still plentiful and cost the same to build with much nicer results. Search craigslist. There was a vortec roller 350 motor for $150 bucks here 2 weeks ago.
Too bad you live too far from me I have a 350 already disassembled and seasoned along with a complete kit including pistons cam lifter I would let you have for the same as the 307 just to get it out of here.