sorry for digging up an almost 1 year old post, but I noticed my 30 year old orange box on my slant six duster leaking goo out the back, and I've had some drivability issues, so I was thinking about getting a new box, was going to get either a Standard Motor LX101 or a Napa Echlin ECH TP51. how did the Hi Rev work out on your slanty?