I have to agree with tbird. Some Maximum Motorsports lower control arms would really benefit you in the traction area. More traction = the ability to launch at a higher RPM without blowing off the tires = lower 60 foot times = overall lower 1/4 mile time.
I'd recommend 3.73 gears, an SCT LiveWire or SF3 with the free custom tunes for life from Bama at AM, and the clutch adjuster kit from AM. Includes a Steeda adjustable cable, Stack Racing firewall adjuster, Stack Racing double hook clutch quadrant.
I know I'm going to need that clutch adjuster kit for sure now. My 2nd gear synchro is going out, so I'm not fooling with the TR3650 anymore, and going for a T56 when I can get my hands on one. Apparently the T56 bellhousing is a bit deeper than the TR3650's, so I'll need to adjust for about about an inch of clutch cable slack. Kind of sad, I wanted to go for the On 3 Performance single turbo kit since their new forward facing header kit is only $2,199, plus the cost of a K member, injectors, pump, etc. But I guess in the long run, I'd be better off beefing up the drivetrain a bit before I add more power, so it'd be one less thing that could go wrong.
Anyhow, for around the $500 mark or less per mod, everyone including you, OP, got it. Gears, tuner, clutch cable and that jazz, shifter, suspension mods, that sort of stuff. The small things that can make big differences. What about spending the extra $ on some 17x10.5s, so you can run 315s out back?