Durango headers?

My '63 Dart has a 360 and 4 speed with manual steering.

I've got 273 manifolds already but I want something better as they're pretty restrictive and i can't afford $750 plus for Dougs or TTI headers.

One of the guys selling the headers on ebay has sent me some photos with measurements so I'll do some measuring on the car and see if it looks likely they could be made to work.