I'm using an os#8 plug. Is it the best plug for this engine? I don't know but it works for me. I can't tell you which regulator to buy because I only have experience with the cline, so you'll have to make your own decision on that one. I also don't know where to get one on-line because I bought the three that I own from an rc store in albuquerque NM. As far as power is concerned, ie.. a moki 2.1 in the Patty Wag... I would have to say it does alright, but not quite what I expected. If I had a chance to sell some of my other engines or trade out for a gasoline engine that is what I would do for the patty. I put a smoke system in my patty with the moki 2.10 and it smokes ok but I think it may also decrease the performance of the engine even with the smoke off, because of the obstruction in the carb.Since breaking my finger last year, I haven't flown the Patty as much as I would like, but I know she could preform a heck of alot better with a gasoline engine. As far as I'm concerned, an os1.60 is the biggest glow engine I would ever buy again. They take alot of abuse and can make the right size/weight plane do some pretty awesome tricks. Any plane that requires more than the os1.60 and I would go to gasoline.I really love my Dave Patrick Ultimate w/os 1.60 and when I had the Lanier Edge w/os1.6 that plane would tumble and flat spin till the sun went down. So when all is said and done, I guess you could say my engine of choice is the os1.6 in and airplane that will fit in the truck without having to take it apart, because who wants to spend the time assembling it at the field instead of just being ready to fly,fly, fly.good luck, and hope everything goes well for you at the hospital.