HELP! tuned up truck andkey wont turn engine off

[dinnut]

i put a new distributor cap, rotor, wires, and bosch platinum 4 tip plugs. and also inline fuel filter and it fired right up. runs 10x better now hands down. i went to turn it off and turned the key off pulled it out and the truck was still running. i pulled negative battery then positive and it kept running meaning alternator was keeping it alive. i finally pulled the wire off of the hei and the truck turned off. i have been doing this all day now and cant figure out why the truck wont turn off. the truck is alot faster now. i pushed it to 60 on a backroad with ease. the hei was on the truck before i bought it.i told the guy at oreilly and he guessed and looked for electronic ignition parts for an 85 chevy truck. on the hei the power source goes into 1 of 2 slots on the side. it wont go into the left sight but it go into the right. anybody please help me. could the thing where you stick the key into have gone bad ( eh i forget the name now)? HELP!