FORUM RULES UPDATED - The forum rules have been updated to continue to provide a friendly and safe environment for our member community. Please take a moment to review the updated rules and our terms of use and privacy policy. Click here for Forum Rules which has links to the 'terms of use' and 'privacy policy'.
The 86 will be an Alpha (1st generation) if it's original. I think the 76 will depend on which engine it is. Here's a chart with Mercruiser drives by years and serial number: