When I was working for a Ford dealership a customer with a Chevy station wagon 454 came in. This was in the early 70's.
Fouled oily looking plugs and run on after the motor was shut off. The car was fairly new but out of warranty. Compression/leak down was good. I found a note in the "technical data books" we had about excessive carbon buildup on the Big Blocks with low miles. Recommended FACTORY solution? Pour a little WATER down the carb as the engine is running at temp. The violent reaction in the combustion chamber breaks loose the carbon, cures "run on" and detonation.
With so few miles on your car I doubt carbon buildup is a problem on yours. BUT, if you don't keep it clean, it could be in the future.
The Chevys main problem? They guy never drove it hard, EVER. With the old point type ignition he would foul plugs fairly quickly. If it's bad enough the excess gas also gets past the rings, diluting the
oil. So it turns into a catch 22 situation. Thin
oil, gets past the rings, fouls the plugs etc.
Ernie