Cam Help

I have a 1989 Mustang GT, 5 speed, rebuilt bottom end, gt40 iron's ported and polished, valve job, short headers, h pipe, Trick flow upper and lower, 70 mm t body and spacer, 73 mm mass air, 24 lb injectors, adjustable regulator, stock computer, flex fan, cold air intake and k and n filter, 3.55 gears, msd ignition, mega bit jr lowers control arms, and boxed upper control arms, frame connectors. I am going to put another cam in it. The F 303 is killing my bottom end and I am convinced it is my problem. I am looking at off the shelf cams, the b, e, powermax 2020, tfs stage 1. What do you all think? I drag race the car, and drive it on the street. What does anyone reccomend? I dont want to change gears.
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