The problem you really have is the stock ECU on those trucks, they really suck. You have to burn chips, TBI with only 2 injectors.
Edelbrock had a EFI intake and 8 injector upgrade that would really make a difference.
I had a 92 and burned a ton of chips until I was happy with it, we put in a 496 stroker, ported the heads a little, cam, steel crank and rods.
The total timing on those trucks is someting like 22-25 degrees at WOT, timing really helps them, but the main problem is just getting enough fuel into them. We put a bigger pump and raised the fuel pressure on mine as a band aid instead of putting on the intake.
The narrow band O2 sensor really does not help either.
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