The 2220 is 4.3 inches long. There is 5 inches of space for a motor on the kit, so a 2230 might fit. You would have to poke the wires through the chassis brace, but I think it would work.

As far as motor size, my experience is the bigger the better. I went to the 2220 because my 2215 was getting uncomfortably hot when running in grass after multiple packs. This was with a gearing of 58/16. Mike's kit lets me go down to 58/14. With a lower kv motor(and a larger one), I think I'm all set for bashing.

It's all good, watching a huge 1/5 scale leap around like a Savage Flux is one of lifes joys.