I think the engine which was sometimes retro-fitted by the factory was not a Chevrolet LS but the Dodge 360 Magnum (or 5.9 litre Magnum) engine, which might well be quite similar in terms of engine mounts to the original engine.
This engine was readily available from Mopar, but I don't think it is anymore. I'm sure reasonably sensible aftermarket versions of the engine will be available from specialists in USA.
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