Not meaning to hijack, but I hope this helps to condense options for shoppers.
Header suppliers for '71-73 w/ 429-460's:
http://critesperformanceparts.com/
Full length, 2" tube, 3.5" collector.
$369
Ford Powertrain Applications - FPA
http://www.fordpowertrain.com/FPAindex/headers1.htm
Shorty, bare finish is standard.
$600-ish and up
Hooker #6115
Long tubes, multi tube slip fit, 1-7/8" tube, 3.5" collector.
$510+ and up
Hedman #85200
Long tube, 1-7/8" tube, 3" collector
$600-up
Mad Dog Headers #8008
http://www.maddogheaders.net/Catalog.html
2" tube, 3.5" collector
Long tube, uses a crossover tube under oil pan for each bank.
$400
I feel that most supplier info is very weak, as in not listing pictures or head style designations (Standard Thunderjet, CJ/SCJ, etc.) Most all have coating potions in addition to the tube cost.
I'm really with Rustang on the BB header issue here. Especially in PA, fitment and clearance is key when driving our semi improved, sad sack of a highway "system" (aka "detonated mine field" in other states).
For that kind of jack that they command, I want my headers to be darned near excuse free.