320 engine mount with 360...
...and light prop will move the CG forward. Probably not what you wanted to hear since your AC is beautifully painted, but it confirms what I needed to hear.
The 360 engine mount seems to have been designed for a C/S prop. For those of us who like the idea of a Catto prop, we should be using the 320 mount even with the 360.
there is very little difference in weight between a 320 and 360.