Issues with 360 engine mounts
The LH mount included 1 extra shim washer for that purpose if needed.
All I can tell you is that the rubber insulators are incorrectly mounted to the engine mounts. Pix of a 69 K frame with V8 installed.
The pic of just the mount have shown is the RH pass side mount
Nobody else had any issues with these.
Hope this helps.
Matt