John, you would be hard-pressed to improve on straight Mobil One of the appropriate grade. A friend who works for the powertrain division of a major OEM told me they were having piston ring problems with one of their engines. The problems disappeared if they ran Mobil 1.
I'm not sure about your 454, but many of the GM V8s of that vintage had problems with piston slap. The noise is annoying, but other than that it isn't a real problem. It's quite possible the original owner used a thicker oil to quiet down the noise. Or maybe even used some additive like STP to thicken things up.
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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