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how about adding power without losing economy?
the 4.3 had some pretty significant improvements over the years that boosted output, i don't remember EPA rated fuel economy ever going down when output went up though.
you would need to modify your calibration to safely do such a thing, but you'll find plenty of communities that are capable of guiding you through it or pointing you to someone who is capable.
4.3 + manual was apparently never offered in the 80s on the S10 blazer though... optional for 1990-upwards. assuming 2WD, original EPA rating of 17/23. i checked 95, 98 and 00 with 4.3/5 speed 2WD, all had the same 17/23 rating.
assuming you have a 90, you're pushing out ~160HP/235lb-ft.
a 95 is ~200HP/260lb-ft
a 98/00 is ~190/250
just food for thought.
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