It has a 65 273 2bbl and I have learned that the intake and heads are different from 66 up. I do have a question that is can or will 66up heads and intake fit properly on the 65 block. I have the intake and dual point dist. from his 66 Commando and was wondering if I got heads could I use them. Thanks guys. I will also add that the 2bbl is not short on power it does hold you back in the seat.