We have done them with both the energy suspension bushings and custom aluminum body bushings..... in theory the poly is supposed to be better for cutting some vibration/noise transfer, but I would venture to guess you really wouldn't be able to tell the difference. Only drawback with a chevelle is that there are so many mounts required, it gets costly to machine a set.
My suggestion is use the poly ones. Don't bother with the stockers, you will have a headache with our body reinforcement bushings and clearances. The "stock" rubbers I can't even get them to fit into a stock, unmodified frame hole. Seems they aren't that great. The poly ones work great.
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