Those Bosch "300's" are really an RV275. You will pickup around 40hp with those, and would be a gamble with the clutch. DD2's are an 80hp injector and will DEFINATELY make your stock clutch slip. It depends on what you do with the truck as to what injector would work best for you. A bunch of heavy towing=RV275. Mostly light towing/around town/empty=DD2.
One more note, there are a bunch of different injectors on the market today, I would shop around a bit more, maybe if you tow a lot and want a little more power than the RV275's then go with a DD1/60hp injector.