1st pic, wires are fused orange to pink, seems to be the case with the other wires. What letter terminal do the wires feed to ? 99.9 % of the time, GM is wired pink or pink w/blk to fused ignition. Orange or orange w/ blk is 12v battery fused, Red is 12v supply (fused or w/ fuseable link), Black or black w/ white is ground.
If the fused pink wires are in cavities B and G, they are the fused ignition injector leads, cav F is the ECM ignition feed. This is refered to as the I/P connector.
This is for a 5.0/5.7 w/ port FI, era '90. Most of the pin-outs would be roughly the same thru the years. Good luck, D