What is needed to build a 7 second (1/8th) street car

My Ported eddy headed roller 340 (strip dominator Holley 750 DP) is 450 HP, unsure of cam specs bought the car as it sets. Hooks up descent. SS springs a snubber, rail connected, 275/60/15 soft street tires. Converter is a 8", Car weighs 3400 lbs rite around a 1.70-1.75 60 ft and 85 mph. Car does have .920 torsion bars (poor weight transfer) Id be happy to get a 7.40 out of it. Should I run lower then 3.91s, Im launching @ 3500 and shifting @ 6500. I have considered dumping 4.56s in it @ the strip and try shifting around 7200. Not sure if that would gain anything