Something tells me, that the warranty on a HEI from the late 70's or early 80's is not an issue. The good news is the parts are GM and not after market. So the book for the car or truck it came from will still be useful. The local FLAPS will have the bits you need. Slot the screw and throw at the guy who installed it. local FLAPS will have the screw too. The test procedure from the car/model will still work. Generic but useful, even covers some trouble shooting of components: http://www.autozone.com/repairguide...Ignition-HEI-System/_/P-0900c15280051338
Should work for you.


Steve H