Diaphragm vs. Borg and Beck.............

From experience, a good B&B pressure plate works good for a long time. But any clutch needs to be able to handle the torque and rpm of your engine. They do it with surface area, friction and pressure. Diaphragm PP has easier pedal effort, Centerforce is a diaphragm with sliding weights, almost impossible to balance. I have a combination Long/B&B that is supposed to be very nice, I have not tried it yet. As long as you don't intend to do 7,000 rpm power shifts take your best guess. They all have their advantages and disadvantages. I like McLeod best so far. You can actually call any of the good manufacturers and tell them what you have and how you want to use it and they can recommend something that should work for you. Use your 360 and what torque, HP, and rpm for your intended usage. That should also hold your 273, unless it is like mine...