I see that engine becoming more popular, but it seems to be the "red-headed step-child" of the small engine world! Nearly, if not, the same external dimensions of the larger engines (340/390/420), but with less power! I may not make sense to try and hot rod. Get a bigger engine and buy the right stuff and make gobs more power!
I have heard SOME of the 240/270 parts fit, but have not been able to confirm that!