early A body engine swap

hello all...i'm a new member but a lifetime A body freak ! i've had 5 Dusters from '70 to 73 and 2 Demons , a 71 and a '72 in my younger years. I'll be 61 in may and i'm feeling the itch for another A body screamer ! I recently bought a 1966 'cuda...6 cyl. automatic with a clear title. I also avcquired a 1964 valiant signet that is in rough shape but had an early model (points distributer) 318 and a 4 speed tranny. My question is would i have to swap the "K" member to put the 318 in the 'cuda or are there mounts available that will work ? If the mounts are available , that would be great ! that way i could easily put the car back to an original , matching numbers , 6 cylinder automatic Barracuda. Any ideas ?