piston dome size need help

[1968BM]

Now this is sounding more like what i need to know. Right now i have a 454 stndard bore with a forged crank and flat top pistons, and 049 heads. I have to get cylinder 4 sleeved and put back to standard bore. I dont think i can get enough compression out of the flat tops to be where i wanna be without out nitrous or supercharging. That is why i want to go with a forged dome piston. Now my question is this what sized dome can i put under the 049 heads? My other option would be to build a 427 out of it.