Well you know the methods:
Forged, high compression pistons and rods (go for 11:1 or even up to 11.5:1), check with Endyn first, and Arias/Crower as back up options (some Endyn piston sets require boring your cylinders first, a costly step...), some Jun or Toda cams, along with of course an solid IHE combo as justin suggested. With these, some dyno tuning, and a solid break in period (at least 5,000 miles), you should get your 14's.
However, I am personally a fan of FI, which would be a quicker and cheaper recipe for speed (not to mention some torque!). You sure about staying NA?
Edited by: JD@af