If I choose a hydraulic cam, with up to .470" lift, the stock rocker arms would break. A friend of mine have a 280/474 cam and his rocker arms were breaking everytime, so he had to buy roller rockers.
really? your friend had to be doing something wrong. i have run and djv is running that 280/474 mp cam with stock rockers. i also ran the 284/484 mp cam with stock rockers, and in my dart now i was running the 292/508 mp cam for years with sock rockers and never had a problem. maybe your buddies push rods were too long or something.