Vin trouble

Welcome aboard-
but your car is an F-body- not an abody. Although most of us can help you, A FBody website may have more info.
As for decode- since 76’ was the first year for that style Aspen/ Volare I’m guessing the program or DMV (you need to clairify that) is wrong. Chances are you are good just a little mis information. Just be careful about posting your vin number completely. All this info comes up on search engines. You don’t want the world knowing your car vin. lol! There are scammers who will use that info to recreate that car before you can register and it will be you proving that car is yours. A lot of good people on here to help.