Lifelong S-10 Owner
I'm one of those old dirty mechanics on here too. I have professionally built the 2.8 V6 engine with bored .030, blueprint and balance job, raised compression, smoothed the inside of the block, V8 cam bearings, bigger camshaft, exhaust, gears etc and its just not worth the money or horsepower on that little engine. My built one ran about like a stock 4.3 engine that's still legal. Warm up a 3.4 V6 and swap it in to keep the smaller size block with a small gain or do an LS swap. The mileage on your engine is putting it on borrowed time. Good luck on which ever way you go.