I didn't know that Fenton made headers for the 292. If they do, then I've learned something. I've used Hedman in the pas with good success on "twin-fours" and decided to stay with that brand. The split pat makes it a little hard to get everything lined up so's you can start the first bolt (especially if ya got a bad heart like me) but after that it's pretty straight forward.
As far as I know, the Hedders are the same for 62-66. (or thereabouts.) I think they only make one set for the 292.
www.hedman.com otta get ya there.