I have a 1989 Westy with 98 k on original engine and almost all freeway miles. I  have babied this van its entire life. Now I need heads which I knew was coming, but my perfectionist mechanic thinks I should consider a rebuild (since the engine's out and it's got almost 100k).  He's a good guy, very capable mechanic, and I trust him-- but the only "issue" with my engine was some wear in the ring bearing (some copper showing). I'm more than willign to finance the rebuild, but think my engine should be good for many more years. I plan to keep my van forever, but want to be a smart consumer. Any help out there?