Any engine can run well on regular pump gas if set up properly. Your question cannot be fairly answered unless you're more specific.
Much depends on what you really want and why you like small-blocks.
If you like high revving, have a light car, and want a chance at some decent fuel mileage when driving easy, it's hard to do better than a 283 or a 327. When I started jerking around with SB Chevys, the "big" upgrade was going from a 265 to a 283.
283s all came stock with forged steel crankshafts. My 65 SS Chevelle with a mild Crane cam, 9.25 to 1 pistons, power-pack heads, single-plane intake with a Holley 600, and headers - along with a M21 four-speed can get 20 MPG on an easy cruise and is fun to drive. Not much torque though and would not be fun in a heavier car.
As far as the rest? The only real performance dogs in the bunch are the 305s and 307s.
The most amazing small block I ever drove was a brand new, stock 302 Z28 Camaro. Very high strung, and not a very good daily driver - but otherwise, absolutely amazing. It did NOT run on regular gas.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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