Walter has it right. PowerMAster GMA 5-29 All-Castor is just as good as Fox Superfuel. Don't skimp on the Castor! Do use a 9-4 prop, and wood, if you really like your fingers as they are; APCs are guillotines!
It's not really a matter of how much bench time, but the quality of that bench time. I remember folks saying they'd hook up a quart of fuel to a Fox .35, start it and go do something else for an hour. That doesn't work! What you need is repeated "heat cycling". You'll accomplish more in 30 minutes of 2-minute runs with a full cool-down after each (say another 3 minutes) than you will with the aforementioned quart of fuel and an hour.
You'll be able to tell the engine is ready to put in a plane by the way it "breaks". Most of the break-in should be a series of 2-minute runs at a fast 4-cycle; blubbery rich only pounds out the main bearing. As you near the 2-minute mark, pinch off (and hold) the fuel line to kill the engine; this will give you a 10-second burst of lean running.
After about 5 of these runs, when the engine is warmed up, pinch the fuel line for 1 second. The engine should break into a 2-cycle for 5 - 15 seconds and then drop back into a 4-cycle. IF it tends to stay in the 2-cycle mode, it's not ready. When it reliably breaks lean and then settles back to a 4-stroke run, it's ready to fly, but don't chance a lean run for at least another hour of flying.
FWIW, Larry Foster recommends 10% (minimun) Nitro in his engines. More power at a cooler operating temperature.