Engine selection has always been a "tribal knowledge" sort of thing. You have never been able to take the HP rating from a manufacturer serious. It is just more about experience and how much power a certain engine has. Even within a certain size, different manufacturers have had great disperaties in power. So creating a chart, would be futile IMO.
That is why, to me, the size and shape of this plane begs for the DLE 35 R. I have a DLE 20 in a 65" Pica FW 190 and it is perfect. That is a much smaller plane than this mustang. Sometimes it is just best to ask those with experience with the engines. That being said, you still need to be carefull here, as you will get a lot of opinions.