I was at a buddys engine machine/parts store the other day, and he found a few boxes of brand new BlackJack Ford headers , still in the box, that have been sitting in his attic for many years. Trying to help him figure out what the applications are for. One set has part number 3603, and are 289-302-351W flanges, the other has 3622, and my guess is 351C/M/400 , likely for a 2 wd PU truck, but not positive. He also has a new set of Hedman headers for a 75-78 302 Mustang 11, if anybody knows anybody looking. Thanks.