If I was you I would go with a set of good aluminum heads and mill them for compression. Get a good cam to match up with it and it looks like you have a good intake/carb/exhaust setup already. That should push you near 380-400hp if you do it all right, and I think it would be better and cheaper than the other routes.
Skyler
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-1989 Saleen Mustang #406-
TFS Heads, Edelbrock intake, E-303, 3.73's, 1 5/8 shortys, Offroad-H, 2chamber flows, 36psi FPR, 15degrees timing, 70mm tb, 73mm maf, 24lb inj, Crank pulley, MSD6A, Alum driveshaft.
On its way: Paxton Sn-89 with dyno tuning and long tubes.
Just added: B&M Ripper, Weldin Subframes, & Turn downs!
13.2@106mph
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