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On my 1930 Chevy, at the points where the body is attached to the frame, there is a L-shaped bracket wieldesd to the frame and to the boby. These are the points where spacers are placed to line up the doors and such. Between these brackets is one flat rubber washer and a number of metak washers, depending on what is needed to line everything up.
My question, is there something better I can use as spacere that may also aid in absorbing the shock and still accomplish the same thing?
Probably not much that would work better.
Thinking through this - the rubber insulator absorbs the road shock. The metal shims are extensions of either the frame or body depending on how they are mounted. Adding possibly a nylon or even a urethane washer might give you some additional cushioning and corrosion resistance, but anything soft like neoprene will eventually compress then you would be back to the project of body realignment (a subject I have gotten to dislike intensely in the past few weeks)
On my '31, I started with the normal rubber cushions, which are about 1/8" thick, then did the rest using 1/16 and 1/8 inch front end alignment shims - now the right side needs a wee bit of touch up - 4th time:CRY:
What you say makes good sense, I think you may have saved me some heart ache. I will consentrate on going through the rest, like the gas tank mounting, fenders, running boards and splash aprons.