Flew one with a 912 extra for many hours and I can confess to many good and valid points mentioned above.
Carl just finished a local Raven a week ago. It will be fitted with a 914 turbo

Should be something to experience!
Apparently Carl is not rushed to finish a build, he takes his time and is willing to customize to aircraft to your requirements. Be it wing tanks, header tank, include the cowl, spray painting, fit the engine. He is flexable.
Brings back good memories, I think I must beg to take the Raven to the skies again!