carb and head question

[bonerific250]

I have a 2001 banshee with .020 over bore, wiesco pistons, boyseen dual stage power reeds, stage 3 dynojet,fmf gnarly pipes & scilencers, ricky stater with +4 timing.I'm running a 320 main, stock piolets 1 turn out with stock carbs clip in the middle on the needle, & I'm in michigan @ 840 elev.does this sound right? and i also want to get my head milled but i don't know what to look for as far as doing it . I thought that the flat of the head was the only thing that got milled and not the dome part, and how much should i take off .020-.030? Could someone help me out with this. And where would be a good place to send the head in this area? thanks.

[crash&burn]

you could think about like this.... shave a little the first time see if like it if not shave some more..... shave little the first time something goes wrong to where you have to shave more off then you have some still to shave off and you dont have to buy a new head... or you could by a cool head or NOS head and just by diffrent sized domes.... just my opinion on it i would start in small increments... this how do my pistons started small so if ding the walls i still have room left to bore out more and dont have to by new sleeves

[bonerific250]

you could think about like this.... shave a little the first time see if like it if not shave some more..... shave little the first time something goes wrong to where you have to shave more off then you have some still to shave off and you dont have to buy a new head... or you could by a cool head or NOS head and just by diffrent sized domes.... just my opinion on it i would start in small increments... this how do my pistons started small so if ding the walls i still have room left to bore out more and dont have to by new sleeves

good advice,Do you know if you need to shim the head after you get it milled? prolly a stupid question but i don't anyone that has done this.And would i need to do anything with the carb settings or octane?