I put a 351 c in a 67 fastback, use the standard small block motor mounts, use a 1970 mustang
radiator and make your own mounts. I went with a 4 speed, and all the linkage is a an easy swap. auto swap is easy too. 351's make great power. canted valves kick ***. I went 11.2 compression ratio, 292 hyd. cam, 13 lb alum flywheel, and am running about 500 horse. U cant go wrong, just get a good block and dont bore more than .030.