I got my JL yesterday, sealed carb and backplate and got it mounted, I have ran 2 tanks thru it so far, and everything is great, engine idles like a purring kitten. I am breaking it in with Byrons 20/12, and a Picco p6tc plug

My question is when do I start pulling head shims out and how many, I will be switching to Byrons 25/11 after break in.