Robin,
I think you have a MECA head not Davis (Davis is out of business, he passed on a few years ago). With the ABN set-up you can run a bit more kero than with the cast iron as you need heat to get it to the running fit. Somewhere around a 10 1/2 x 6 - 7 prop should be a good starting point, they do like to run up the rpm. For fuel you should use something like 25% ether, 25% (75/25) Syn/castor and 49% kero, 1% ignitor. I use a very simple blend of 2 parts Starter Fluid (with 50% ether), mixed with 1 part mineral oil and a splash of Amsoil cetane booster. This is good for general flying and is easy to get in the US.
Let us know what ship you will be using it in and how it works out.
Best, DennisT