engine swap problems

From what I was told I have a 73 and up v8 k frame. Pic it kinds bad but is that right? I got the schumacher mounts and for some reason the drivers side mount is inch/inch and half longer. Can I just use the mounts or it there mods that need to be done to the drive way perch? From what i thought only the slant k frame needed mods :/ :coffee2: