When I started modding my 86GT I was told not to go too big on the TB since it would hurt low end torque. If you look at my sig, I'm only runnig a 65 mm TB, and I just dynoed 277 RWHP, which works out to somewhere around 325 HP or so at the flywheel. If my convertible wasn't such a pig I bet I'd be looking at low 13's. Take a look at the Analyzer here - you can probably keep the stock injectors and just add a fuel pressure regulator and be OK on fuel.
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86 GT, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms, 277 RWHP.
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