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From my experience, older vehicles don't have tight tolerances so, you may be fine because 5-10mm was acceptable back in the 80's. I don't think the real issue is whether the rubber mounting can absorb the shock or not. The real issue is, will it cause premature wear to the rubber mounting and other components that it will affect by being mounted in a slightly altered position. You will know this when the engine is fitted and will be able to see if the rubber component is already stress without it carrying the weight of the engine.