Hey Bill! is this the engine you where telling me that you have ready for the ARC Ryan's Rebel, looks very nice, you can go to greinger's or some other industrial supply store and get some vibratrion isolators and install them in between the firewall and the back of the mount, if you do so let me know that way I can make the front of the plane an inch shorter to make up for the lenght of the engine to cut down the front weight. You know what I will throw in the dammpners free of charge for you! ok.
Happy Landings.
Bill Pomplun A.K.A. Aero Nut.