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That is the first I have heard of the two rings, and as far as the heads go, nope, can't beat that price with a stick. Ports clean up pretty good. You may or may not find a shark's fin going to the valve guide inside the intake port, part of the long side turn before the port. Get rid of it, tons of bottom end power is gotten by removing it.
Also, the newer hardened cylinders are a major plus in reduced cylinder wear, 150K miles results in no ridge at the tops of the bores, so you may need to do nothing but hone the cylinders and be done with it.
Also, the newer hardened cylinders are a major plus in reduced cylinder wear, 150K miles results in no ridge at the tops of the bores, so you may need to do nothing but hone the cylinders and be done with it.