motor mount question

I guess I'm lost as to why you're putting washers on the passenger side mount (2nd & 3rd pic)- a 318 mount requires no shimming on the passenger side, a 360 is identical there. 318 & 360 use the same pass. side mount.
The driver's side mount is the one that requires a spacer to use a 318 mount on your 360- and only on the rear tab. It just needs to be 1/2 or 5/8" thick, IIRC. Use a steel bushing, spacer, stack of washers, whatever- just so it bolts up tight.
And get some big, fat washers on those through bolts, otherwise your motor mount will just pull out of the K frame again (first pic).