I have a 71 grande with a c-6. ive decided to put some money in it an have some fun. I want to put a new rear end ratio in it because now it has 3.00:1. I dont know what ratio to use. i want to drive it to cruise in on the road an still be competitive at the track. As well im going to swap cams to somthing else as long as some other little things exhaust an torque converter. If anyone could give me some advice as to what ratio they would put in an cam too.