Not Ranked
Check out DSS. They advertise in Mustangs & Fast Fords all the time. I don't have their number off hand but if you call them they will send you their catalog to order from (I'll bet their name comes up here if you do a search). Great company to deal with and they offer top notch stuff. Short blocks, long blocks, stroker kits, heads, intakes, EVERYTHING.
If you're looking to get closer to 500HP, I would suggest going with AFR205 heads and the Victor Jr. intake. You'll make the biggest gains in HP with Heads, Intake, and cam choices.
Have fun!
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