Not to infringe on your intelligence, you have all you need for that little miata.
The GT-40 has been known to exceed 300Ft lbs of torque as it is.Your at 235HP on the motor stock(GT-40),so to get your extra 15+Hp, my guess would be to just add a cold air intake, under drive pulleys, and advance the timing and hold on. You don't need the 24lbs injectors
Don't always look at horsepower.
347 , 11:1 Compression,Knife Edged Lightened Crank,AFR 185,Ported Trick-flow Intake,Ford X-CAM,Under-drive pulleys,aluminum drive-shaft, 3:73 gears,Fender Cold Air Intake,Long tube headers,MSD Digital Ignition System
444 HP 436 FtLbTrq. high 10 second car !