It’s a mixed bag. 55-57 use the front side L bracket motor mounts. Earlier motors used studs in the timing plate. Later motors used the side mounts. Some 58 and up motors had both the front 55-57 side mounts and the later side mounts. Other motors just the later side mounts. So unfortunately there is no bright line rule.

Last edited by mdonohue05; 01/28/18 01:03 PM.