I'll be honest man seeing its a used engine I wouldn't dump a ton of cash trying to get it started. I did that on my 1st nitro and gave up eventually and bought a new engine. I later found out that the motor was shot that I got with my 1st truck.

A nice engine that is relatively cheap that looks like it MIGHT fit is a HPI Nitro Star T-15. It was the 1st engine I bought new and is extremely easy to tune and pretty reliable. Its also really fuel efficient. a 75cc tank gets around 15-20 minutes of run time, I've ran about 80-85% of a bottle of nitro through mine, and it still starts on the 2nd-3rd stroke of the piston. Hell it still has the same glow plug in it that it was shipped in even.