It's the free mods that give it more power, look to see if the tamper proof covers are on the power screws. That will tell you if they have been turned.
As the pumps get some miles on them you sometimes need to turn them up so it will move.
No I wouldn't say I'm blowing a lot of smoke . On start up in minus 2 c we have had the last few days
1990.
New fuel filter
Installed electric fuel pump(wondered if the lp was bad )
I should try a run without the air filter on it to see if anything changes
For example the 1990 on the mat on a medium grade hill might gain slight speed and the 1993 will gain a good amount
Might wanna check your throttle linkage you might not be getting full throttle travel. Also no I/c will make a bit of a difference but I think the 3.07 gears is what's really killing your power
I wish I knew the history on these trucks because they are two totally different animals in terms of power
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