Cast Iron Headers FE

I scored some Factory Cast headers at the local swap meet for my FE # COAE9431-B. Anybody know what these came off of?
Their gonna fit and haft to be better than the stock manifolds I've been stuck with. The speedway crossmemer I used won't allow the fit of any standard headers I've found so far and Sanderson won't return any E-mail about the 427 headers which might work.

These manifolds should be from a 1960 Full sized car with a 352 HiPo engine.