b motor into a body

i have a 68 barracuda that came with a 318 and i am attempting to drop in a 383 (1) if schumaker isnt in business anymore where can i get motor mounts ? (2) i am planning to install headers on it , but for now i wanted to install manifolds . can anyone tell me what part number manifolds i should be looking for when i hit some swap meets or possible a reader has a set for sale reasonably thanks justafish