4.10's or 4.30's for 8 3/4 gear swap

Need some input just pulled the third member on my 742 case 8 3/4 looks to have had a gear swap and a spool not long ago but the gears are 5.13's or 5.17's to low for my 440 build going to change to 410's or 430's the motor is a 68 440 30 over factory forged crank eagle 4340 forged h beam rods je flat tops two valve release high volume oil pump 1/2 inch pick up 7qt pan high tech double roller race timing chain by comp cams solid lifter comp cam 550-570 lift with 1.6 ratio roller rockers to make lift 579-609 power band is 3500-6500rpm's pro comp heads with edelbrock valves and comp cams dual springs mild port job 72 cc combustion chambers 280 runners valves are 1.81 and 2.20 edelbrock victor intake hooker competition plus fenderwell headers gonna buy a 950 or 1050 main body and use the parts from my 850, compression is a bit over 11.1 gonna use a 3500-3800 stall converter with a 727 reverse manual valve body car is 2800lbs did the gear ratio calculater and i think 4.30's will give me the best et slicks are 29.5 x 11.5 x 15