13.99 or quicker.... yeah, you'll need a helmet (and a rollbar/cage).
My approach: Nitrous Express single nozzle system jetted @ 150hp, an adj. fuel pressure reg. (40psi), fuel and nitrous pressure gauge(s), bottle heater (1000psi), one heat range colder plugs gapped at .035" (Autolite 24's), 93 octane pump gas, 12-14 degrees timing, an MSD window switch, and a pair of M/T ET Streets. Just my opinion...
Motor wise? .... like mentioned: heads, intake, cam.
Suspension wise? .... depends entirely on the primary function of the car: if it's primarily a street car: upper/lower control arms, aftermarket K-member and A-arms, adj. coil over struts, adj. shocks, etc.