With a mild engine you really won't realize much if any performance benifit with 4 tube headers. Depending on where you end up with your engine setup you may even be better off with Ram Air III manifolds, as far as noise and rust issues are concerned. All depends on your other go fast goodies as to whether you really need headers.
http://kurtspontiac.homestead.com/DavidJones69GTO.html
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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