64/65 hemi k's have the mounts in the same place as 66/70. The engine brackets are different-race hemi and street hemi are not the same bracket.

The easiest way to tell is to look for a skid plate. 64/65 will not have one. The other thing is the sway bar holes are not drilled on the 64/65 k frames. (on the front lip of the k)