Changed my oil, Now it smokes

i'm no expert but at a mopar show this motor guru guy said my 340 couldn't keep up with the 750 dbl pumper and the end result was unburned fuel in my oil and ring damage. then he mumbled i just as well start the rebuild now. well i've had no problems, and i'm far from the only one with this setup but i didn't forget what he said either. i hope your problem is simple or even gone by now. gud luk