With a 5 speed, he got the good venerable TBI 4.3 rather than the CPI 4.3 that you can no longer get a new spider injector.
Checked the numbers, I was curious. 36,663 1992 4x4 2 door S trucks made. 3,114 had the 5 speed. Correct me if I am wrong, but that looks like 47U Royal Blue and 26L Sky...