Concerning a single four intake, you have multiple choices, all of which should be able to support 500hp except for maybe the eldebrock performer (not the rpm), which has small ports.
Dual PLane
Edelbrock Performer RPM - larger ports than the Performer only version, but maybe still not as large as Sidewinder or Blue thunder. Most reasonably priced. May not make as much top end hp as sidewinder or bluethunder.
Sidewinder - good large ports, factory ford part, about $350-500 used. Came with just casting numbers on it (full plenum divider), some say SHELBY (notched plenum divider), and I've seen a couple say COBRA. With the carb and turkey pan, you can't see the script anyways. The carb sits offset to the driver's side.
Picture of one
http://www.clubcobra.com/photopost/s...php?photo=5727
Cobra jet - Dual plane , cast iron or aluminum, good large ports, but heavy if use cast iron. Carb sits in the center of intake.
Blue Thunder - ?improved version of cobra jet intake, reasonable price, excellent performance for a dual plane, what most people use for a period correct piece. Probably the best performing dual plane, with the sidewinder a close second.
Single PLane
Dove - extremely large ports, some say too big for both top end as well as low end.
Edelbrock Victor - smaller ports than dove, may make more hp at low end as well as top end. Probably the best single plane now.
Offenhauser Port-O-Sonic - until the victor came along, many people used this for racing, as it has smaller ports than the Dove.
I can't think of any others.
You would be best to talk to a ford specialty shop, like Rob at Blue Oval Performance (reasonable prices), or southern automotive, who both have possibly used all of these intakes and may have tested them on the dyno.
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