Pretty sure you're going to find the 2.78 uninspiring behind a 253/trimatic. If it's just for weekend blasts around the city why not just go for a 3.55? You can't see the ratio and you're already none original on the carb so I don't know that you should worry about all matching.

Does that mean we get to see progress photos soon? Your old blue van is almost at the front of the queue in my shed to get done.