No special oil needed for break in. I'd add a quart of GM EOS (engine oil supplement) just to help the parts wear together slowly and evenly.
I've only had one alchohol burner and I just leaned the mixture at idle to get it warmed up. If you tried gasoline it would probably foul the plugs quickly, if it would even start with the mixture being so rich.
Plumb a ball valve into the plenum chamber and open it a little when you fire it up so it'll get the oil up to temp. Then hammer it.