I have seen one of these with a DL 50 and it gets up and runs. If both engines are going to cost the same, I'd go with the one with more power. I've seen one fly with a G62 and it landed the same as the one with the DL, so the extra weight isn't going to be a problem. Pe, what kind of props/rpms are you getting? Does it run good with a standard cowl/pitts muffler?