I have a similar set-up on my KDX220, the only exception being a 35 mm carb instead of the 36mm carb.
If it were me, I'd start with a 155 main jet. I have the CEL needle jet in the 2nd clip position from the top and a 35 pilot. I think when I had the stock needle jet in, I ran it with the 2nd clip position from the top and either the 40 or 42 pilot. In both of these applications, I purchased a handful of plugs and did plug chops as described elsewhere within this website. I recommend that you do the same regardless of what everyone might tell you, could save you some bucks!
Does your bike have the stock or aftermarket piston in it? If it is stock, I would recommend changing that out and cleaning the kips valves while you have it open. Many have said that the stock pistons for the 220's had skirts that were prone to crack and cause serious damage to the bottom end. I think I spent $125 on a piston, rings, and bearing. I took it down over a weekend and got it back together pretty quickly - not a bad job at all. Just my 2 cents.
Good luck!