I know MSD lists the retard modules here (link below). See if there is an instruction download or contact their tech reps. They should be able to email you something if you can't find it on their site. www.msdignition.com
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!