You may have this figured out already, but I figured I could chime in.
You do not use the preload plates when running an LS adapter plate. The adapter plate becomes the preload plate. When we machine our own adapters we put a pocket in for the "bulge" of poly just like the stamped metal preload plate. The metal preload plate is used when you put the mount on a chevy SB or BB, just as has been posted.
Also, I will point out that on ATS mounts, Art Morrison Mounts, and our own mounts the energy mount pad is actually "upside down" in relation to how you normally view the mount. This helps lower the motor.
Make sure your stands that bolt to the frame are for a Chevy too, if one is taller from the bolt hole center to the top surface it won't help your situation
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