My 340 is at about 375HP with 3.55 gears. My clutch is supposed to be pretty much factory 340 specs. It might be a little stiffer than factory, but not much. The diaphragm has worked well, so I'll probably stick with that. All street driving. That is not to say that I don't light the tires up occasionally. It sounds like the B&B might be more than I need. Thanks for all the input.