The 67-7113 cluster gear had helical teeth on the big gears up front, and straight cut gears on the rear two. It is intended to work with a 14 tooth main drive gear, so the transmission will have pretty darn low first and second gear ratios. It was designed to work with the 41-42 flathead 4 cylinder engines that were built for pickup trucks back then. Very few people want that sort of gear ratio matched up with the V-8 engines. I’ve got a lifetime supply of them on the shelf here…. I can mention you in my will if you’re moved to have your own collection.