Schumaker vs TTI Headers

I have had a set of chromed headers on order from Schumacher since Dec 22. They are for my'73 Duster 383. Back order is expected end of April. (Were expected end of Feb) They won't tell me what the problem is, but it is at the manufacturer. Worth the wait, I guess. Chose them because of installation without any modification. Question I have is ....Will I need to get different motor mounts? Should I get the parts that mate to the headers and will swivel to any direction to mate with the exhaust pipes?