have you ridden it with those in there, and do you know where was the sled rode before for elevation wise?
370's doesn't sound too far off, I have 410 and 420 staggered with twins for about that elevation and im a little on the fat side of things. im still checking to see if i can go leaner, but check your wash and plugs.
I haven't rode it yet, bought the sled with a blowen 800, the guy had 370's in it, he rode between 3400-6500ft. I bought a 800, just dropped the engine in on Sunday, hoping to have her lit up this week. I put 420's in with the needle on the third clip up. You think it's going to be a little fat? Maybe I'll drop to 410's and see how the plugs look.
nah, i would run start off with the 420's. never hurts to be safe. and watch riding the mid range for extended periods of time. they are wicked lean there.
I just checked my wash too,
but i also have egt sensors so once i get my wash down i can monitor it by the temps.