No spark in 1997 Chevy Silverado 5.7, not fuel pressure/regulator problem?

I have a 1997 Chevy Silverado. It doesn't spark at the coil. I have replaced/checked ignition module, disgtributor cap and rotor, crank sensor, camshaft sensor and ignition harness. It's not a fuel pressure problem. Took everything off the distributor earlier and put back on and the truck started and ran fine. Shut it off and it wouldn't start. It cranks over and over but no spark. Took the coil plug off and checked and no spark. Any suggestions on what else to check? I don't have an ohms meter or voltmeter readily available.