i have a profrom 750 hp center sec with billit base and pro comp 4 hole emulsion blocks,i can get 14.1a/f at idle in gear, but off idle till about 1700rpm it runs 11.8a/f,from there till 3000 rpm runs 12.5a/f at my cruise rpm,wot stays at 12.8a/f car runs good want to clean up the cruise rpm,the carb has 74-86 jet,if i go down to 72 car sounds,and act diffrent,has 75-73iab-36-36hsab,the blocks are 4 hole,i have 1 and 3 blocked off and 2 and 4 are at .028,ifr is .041 pv .055,if i change the ifr to .030 would that lean out the cruise open to suggestions and the powervale is not opening at that cruise thanks

The ifr size is where I would start. .030" is a large jump from .041" perhaps .035"-.036" as a start.

should i do all 4 at the same time

I moved the IFRs down to bottom of well , if it were me i would go .030" (all 4) , you'll just have to play around till you're happy , i went as small as .021" on an 850 mighty demon.

Good call on the emulsion bleeds , i usually drill these to .025" along with .025" on the MABs , same deal with the kill bleeds(.025").