RE: engine for rusty, HELP PLZ!!
I was talking about the Wasp.
Here's some furhter advice: If you are going New and keeping the p.15 buy the OS... Tower still has them for a steal at 99 bucks... If you can swap your old mill for the 2.5 with 50 bucks I would go that route. The OS will be easier to tune, but both will perform MUCH better than what you have now.