Steve, if the rubber isn't pulling away from metal, should be OK [look OK in pic] the rubber is to insulate the vibrations from engine from traveling into frame & body
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Some times I wake up GRUMPY, but today I let her sleep in !!!!!!!!BLACKSTOCK Ont.
Well since the rubber insulates the chassis and body from the powertrain, I would recommend replacing them, new reproduction, not that much money (~$40), here is one source:
1956 Pontiac Pathfinder 2dr sedan, 496 - dyno'd 545 hp, stick shift, 4.11 posi - Hot Rod