stall speed?

I am going to guess about 2000 on the stall and like Greg says it'll flash a little higher. I also can't help any on the weight issue. There were so many combinations and I don't have much experience there but one thing I will say is DON'T GUESS AT IT. Make sure and talk to someone who knows their 340's who can steer you right because if you use the wrong combination the least problem you'll have is a vibration that'll cause you to pull it back apart to change parts. The worst could destroy parts. Hopefully someone on the board that knows 340's will jump in here and help.