From what I’m seeing on line, a junior cylinder,or barrel, is from $687-$712 depending on the web site. I’m estimating another $100 for the piston and ring. Then the price of the lower end rebuild, and EVO upgrade. I would have a certified shop, Unser, do the work so that it would remain legal to run.
I wasn’t sure if there was a on line source that had better prices on parts or rebuild kit than what I was seeing on google searches.