Hi i have a 67 lemans with the original engine and trans. I'm wondering how the 2 speed powerglide will perform once i finally get the car up and running. I've heard that some people really like the powerglide for racing but im hesitant to believe that. How is it on the freeway as well? I'm not too worried about gas mileage because i know its not going to be good anyways but will it be at a super-high rpm while going 70-80? This is my first project and im excited to get it started. Im thinking of getting a 4 speed manuel tranny instead. Any advice?