5.2 magnum options

Pushrod is an easy check. Just look at them/pull them and roll them on a piece of glass. Lobes are pretty easy to see too, just pull the covers and rotate the motor over, looking at every rocker. Hydro rollers will colapse with no oil pressure after a few minutes, but it should still be evident. You got a computer cam in a carbed motor, not the most efficient but its what you got. You sure your plugs are 18436572 CW and no arcing? A transposed cylinder will be worst at idle. You could always put the timing light on each individual plug lead and watch for any misfires at idle. That and a compression check, thats pretty easy to do with no disassembly.