Hoplessly confused,
Look for the letter "P" in the eighth position of the vin. number. This denotes a 5.7 LT1 motor. A "W" in this location denotes a 4.3 motor. Hope this helps. As far as miles goes on ex patrol cars goes, my son has a 95' caprice with 330,000 original miles on it.
Alan
"9T4SS"