I've heard a great camshaft for the street is a comp cams 280H cam. I think it has 280/280 total duration, 230/230* duration at .050" of lift and .512" total lift. I heard it's kind of a lopey cam, but has a huge power band and very strong all around power with great top end up to 6000rpm. You may want to change your intake manifold to a performer RPM if you get this cam to optimize it. This cam is the closest to a all out performance cam you can easily use on the street, so it is a VERY MEAN street cam. I don't know if you have true dual exhaust either, but that makes a HUGE difference as well. If you want to keep the performer manifold and the performer heads (i assume they're both just the performer and not performer RPM) maybe a comp cams 270H would be a better match for your car's combination and it would still be a good step up from your cars 260/270 (stock) duration cam because it has more intake duration and a bit more lift. Good luck.
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'84 Mustang 5.0 T5, FMS aluminum radiator & 180* thermostat, 1 5/8 shortys/2.5" duals, '88 GT tail lights and wheels, Holley 4160 4 BBL, smog pump idler, more coming soon
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