Cool Swap, I followed along. My brother has a 92 S-10 with the 4.3 that I'm waiting for him to get done with so I can take it and put it in my Jeep.
You said you've seen a good increase in power and driveability, but have you checked to see what kind of fuel economy numbers you are getting? I know it's never worth it to swap engines to gain fuel economy, but I'm just curious.
Also, what gears & tire size are you running?