Hi, I'm building a 1700 fast road xflow and using a Corsair 2000e box and was wondering what would be the best diff ratio to use. I'm more interested in acceleration than high top speed (90-100mph would be fine) My car is a '65 Mk1 2dr Cortina, originally a 1200, I think the diff in it is a 4.1, could I use this? Any advise would be very helpful, cheers Dave