Obvious question: are #1 and #8 plug wires swapped at the cap?when I pull out plug wire #1 & #8 no change in idle or revved above 1000rpm.
If you moved the injectors and the miss didn't follow the injectors, it's not the injectors. DO YOU HAVE POWER/GROUND at the #1 and #8 injector harness? Will it light a 'noid light?
Do you have appropriate cranking compression pressure?
Have you popped a valve cover to see that the valves are opening/closing?
Will your #1 and #8 spark plug wires fire an HEI-calibrated spark tester?
Spark plugs on those two cylinder fouled? Cracked? Not gapped properly? I bought a '97 K2500 with L29; had a dead miss in #8. Also had a transmission that wouldn't engage the converter clutch. I figured I'd be spending real money to fix the engine and the trans. Turns out that I had a broken (cracked) spark plug. Stuffing in a single spark plug fixed the misfire, AND the computer won't engage the converter clutch if a misfire is detected--so the spark plug "fixed" my transmission, too.