Horse Power and torque

Stock i beleive they got about 210hp... atleast thats what a google search turned up... Not that it matters much, on a truck that old it'll depend more on the condition of the engine and various components than what it came with.

from what my books say, the 1988 5.8L has 210hp @ 3800 rpm and 310 ft. lbs @ 2800 rpm