Rattle in engine

[RyanG]

Well I just took my truck for a test drive after replacing the carb and now I notice there is a small rattle coming from the engine when I put the pedal on the floor. My alternater belt also squeaks when I step on it. Not sure if that has anything to do with it. Could it be that there are some lifters loose or is it the rods? It sounds like pennies or something in a tin can. the oil pressure is good also. Just thought I would add that in.