Friend gave me Two Spark Ignition Engines -- Converted

Many of my club members run spark ignition. By no means am I a expert on this subject as I only run them on a bench. They fly them, service them, and know all the ins and outs. Floyd Carter might be the person that would help you. He's extremely knowledgeable on any spark ignition engine. He can be found on Stunthangar.  I recently began running sparkers  myself. I have a Larry Davidson setup myself. I personally wouldn't use the old methods as they can be very unreliable. In addition, Larry's being solid state shuts off so the coil isn't energized after the engine stops.  In addition, I use glow fuel when running spark ignition. It runs less on a tank than gas but I prefer it because it's also quieter. You could run gas as some of my members do because they feel it starts easier, I don't believe that as I have used both successfully. My club members that use gas is due to not worrying about the residue eating the paint.
           Gasoline mix is 3:1. Many of them use Coleman fuel and a 2 stroke oil from Walmart which they claim works the best.

            The traditional mix was 70w oil, for low performance engines such as yours, motor oil will suffice. Glow fuel though will work fine assuming you keep the castor content high. The Arden has a enclosed timer housing while the Mccoy doesn't. Personally, my experience is that if I was to run them, I would have Larry's setup. Reason being is that if the Arden starts pushing oil out the nose, it will contaminate the points in a few minutes of running whereas the Mccoy is open. The metallurgy of the Mccoy isn't spectacular. Open point timers will work just fine with a standard 3 volt system whereas the closed timers can benefit from a little higher. I use 3, 1.2 ni-cads on Larry's coil.