I know headman may not be the greatest, but I have had mine for 6 years, 3 cars,3 trannys, three exhausts. They only needed a bit of prying the odd time. They fit good and plugs are easy to get at. They are in great shape still.
My buddy has flow techs and they have larger primary tubes. They were a POS to put in(3 pieces and kinda leaky). They probably flow a little better though than the headman.
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri