Best guess on 416 motor

i have the same cam in my stroker i think, ultradyne solid, 263/[email protected] 631/657 with a 1.6 rocker , i have 11.8 compression, ported eddy heads, flows [email protected], tunnelram,2-660s carbs, 4.10 with 28 tall tire. i havent had it to the track yet, the ring gear on the convertor went out to lunch after cam break-in, so i was down for a week and missed the last race day @ gateway international, i would like to say the 4.56 is to steep, and like you stated you are going to put the bigger carb. on it, it can handle the bigger carb. if it hooks 10.90 easy . if it hooks and no problems with fuel pressure on the other end, and if jetting is to lean. my 2-cents. my 418 pulls really hard, lots of torque. good luck keep us posted, p.s my cam is installed 2.5 degrees advanced. id go 4.10s if you drive it on the street.