How much milled off heads to raise compression

Yellow rose has nothing to do with anything. The op stated his goals and whether or not you bothered reading them you gave the advice that he could hit his engine with a 150 shot, on stock pistons. So I guess your disclaimer is "if done correctly", how about before you give advice first read what he was trying to accomplish before hand. Hitting a stock engine with a 150 shot vs an engine making 400 plus hp with stock internals is an entirely different thing. Were you not one of the "aluminum heads will cure my compression woes guys", how did that work out?, now you are spouting off the same thing as yellow rose, the irony.
Now remember before you call me cute or smart *** you're the one who made your snide remark to lure me into this conversation...
The op had described somewhat of stock engine and aspirations of doing 11 seconds. Also aspirations of using nitrous. then someone came in and said that he cannot use nitrous unless you changes his Pistons can't be done...
Then someone came in and said that you can use higher compression if you have aluminum heads... (and was cautioned in a personal message not to use the disagree button or I would be banned from the Forum but a monitor)
Whatever you want to make up to make your end of the discussion sound better is fine with me. I always wanted aluminum heads I got aluminum heads and now my old heads that are not old but in very excellent condition will go on my next project no big deal...
OP doesn't have to do anything he can just sit back and watch this entertaining thread instead of spending his money at the drag strip..