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Start with the basics. First check for spark out of the coil, check for spark to ground. Make sure coil wire is not arking near water pump. Other check can be made before you go to the ICM. Let us know what this test yields and then you can go in the correct direction.
If you have good spark, 1 inch ark, from the coil, the ICM, and coil are working. Make sure the coil wire to the opti is good and is not arking at the water pump area. If all good, check for spark at the plugs.
If you have spark there, have you check your fuel pressure?
BTW, did the opti slip on easy to the front cover. If it did not fall on and you forced it in some way, the shaft could be misaligned. The bolts should not pull the opti to the case, just keep it on.
Thank you for all the assistance. No spark at coil. Had ICM checked,was told it was "ok". Replacing coil & wire tonight. Not my Corvette and have been trying to fix over the phone. Visited in person, found no spark. I'll keep you updated...