Ah sorry that i didn't reply sooner. The headers that i am using are for the 1967 up camaro. They are the Headman brand. They work only due to the steel, homemade adapters that have the 460's bolt pattern counter sunk into the plate and the BBC's pattern on the outer edges of the plate.
Charlie on the forum offers these types of adapters made out of aluminum. The headers fit extremely well and they are very much like they where intended for the chassis.