Just to circle back around to the original problem. You took everything apart because you had valve train clatter, correct? Is this a hydraulic roller cam or a hydraulic/solid flat tappet 5.0/302 motor? Was the engine running fine, then developed a problem, or like that when you got it? Unless parts were severely worn, then removing and replacing parts of the same dimensions isn't going to fix anything. I suspect your original problem was/is oil pressure, or cam related. Please answer the above questions, so we can narrow in on your original problem. I'd hate to see you throwing away your money and not fix anything.