Stumbling Slant --what is left??

Bought it in 2010...the guy I bought it from claimed it had 80K on it. My odometer has been broken since 2007, but I drive it every day 30 miles RT to work, so figure maybe 8K a year, so that's somewhere north of 170K on this engine. I had 285k on the 170 (this one's the 225) before I replaced it.
Mileage is important, but so is the history of that engine. A well cared for engine can go a long time without a rebuild. If the heads never had hardened seats that could be one reason for low comp.