A DLE 35 RA is a good engine but there are other good engine choices and some reasons to pick various others. For example, if noise is a consideration the Evolution 33 is quieter. It was a better choice for me in a retrofit where beam mounts existed.as the Evolution offers dual mounting choice. With its front carb, it might provide a shorter thrust washer dimension... though I'm not sure on that.

Both mine and the other in the local club run rich in mid range but neither of us has experienced any plug fouling problems from it.

Last, I was limited to an 18" prop and the Evo 33 could be propped down to an 18, possibly because of rotary valve compared to reed valve. I'm thus thinking it will spin more rpms happier with a smaller prop.