Hello radial fans!

I read that some are having troubles with air and/or fuel leaks on their radials. Here is a photo of my never used Evo 7-35.

Is it necessary to add O-rings under the jam nuts on the fuel intake tubes? Also, is it necessary to add something like Permatex RTV high-temp silicone to the crankcase backplate?

Thank you for any suggestions!

–DJ