How do you unsecure a 350 motor in a 94 Yukon?

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I own a 94 Yukon since 99. I've done several tune ups in the past. I recently did a tune up & it won't start. I replaced the cap, rotor, wires & plugs. I bought GM parts. I bought them at Advance Auto Parts. I gapped the spark plugs at 45. I did accidently cross the 5 & 7 wires on the cap. I knew exactly what happened by the way it sounded when I tried to start it. I corrected my mistake & tried to start it again. It still didn't start I let go of the key the horn chirped 3 times. I talked to a retired mechanic I know & he recommended me to replace the control module in the distributor. I did & it turns faster but it won't start. It acts like it wants to but eventually the motor binds up & the horn chirps 3 X. One time I was trying to force start by keep on trying to start it & the horn went off & never stopped. I disconnected the battery. My mechanic friend double checked my work & couldn't find the problem. He said cause the horn chirped it was secured by the security system.