Oldschoolpony: if you're that far into it and they claim they can do that kind of headwork for you, I'd say go for it. IF it's just for racing and not street action, that is.
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Just an FYI comparison of Windsors vs. AFR 165's (street legal version):
AFR 165 SBF Street has a 165cc intake runner and flows 250/185 cfm @ 0.500" valve lift. Combustion chamber is also 58cc.
World's Windsor heads have 200cc intake runners and flow 232/145 cfm @ 0.500" lift. Combustion chamber is 64cc.
This info is straight from their own respective websites. BTW, I think
sedanman found some guy running AFRs and an E303 cam with few other mods that ran 11.90's; at least that's what the post read in Street Racer's Corner.
I might be a college student making under $10 an hour, but I'm saving my pennies and getting the AFR's this summer.
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch 