i'm thinking about porting my lower but i don't want any down time so i want to get another cobra/gt40 lower to do it. are there any differences between the years? thanks
^^ Exactly. I had a Ford Racing lower on mine for a while (was heavily ported, too much for my setup, now I wish I had it back lol) and it was setup for an '87-'93. Simply plug it and you'll be happy. Mr. Gasket sells a nice set of stainless steel pipe plugs that stay nice and shiny and complement a detailed engine bay.