My 47 has the original driveline with a 218 recently rebuilt and bored .40 over. (or is it (.04?), anyway, the motor heads will know. The rear end is 4.11 and recently rebulit with all new axle bearings and seals also. New wheel cylinders and brakes. I found a lot of good information on gear ratios for higway speed. With my current setup I have no trouble cruising at 60 MPH. Is there a transmission that will direct bolt in that will allow me to comfortably cruise at 70 MPH on the interstate? The way it is now I have to stick to the back roads, which is fun most of the time but if I want to attend a show that is some distance away to makes it difficult. Modifications to the bell housing/adapter?