where to get motor mounts for dart

well i have a dart thought it was a 72 but its a 73 that had a six in it and now i need some mounts to go from the 6 to a 360..i know i can get the high dollar 1s but didnt wont to go this route if i didnt have to..anybody have a idea of where to get some or if anybody have some they may like to get rid of..mike