Hi Bill,
I broken in my Saito 72 with a 13x6 prop, Byron 20/20, and used the R/C carb to control rpm. I ran the engine for short times in the beginning, 1 then 2 minutes, and then I ran several full tanks and increase the rpm as I went. I used 1 gallon on the bench. My Saito only became reliable after the 2nd or 3rd gallon.
I made a special venturi which works amazingly well. I will send you a drawing if you want to have it made.
Once you get used to a 72 it is not a big deal. The 72 is just enough for the P-47 in my opinion. I have always been using a 70 4S so for me this engine size is pretty normal like a walk in the park, nothing extraordinary.
For flying I like the JXF 14x6 and 14x7 Electric props, never tried some of the 3 blade Carbon Fiber but I friend loves'em.
I use a Sullivan 6 Oz RST plumbed as Bradley Walker recommends, perhaps you have seen some of his plans for Saito engines which ilustrate how he does the tank. Very important to sit the tank with 1/4" offset on the rear so the engine will quite at once at the end.
It will depend on how you will setup your venturi to control the power, but expect to use from 3.7 oz to 5.5 oz. of fuel. Never use anything but 4s 20% Nitro 20% straight synthetic fuel.
4S does not like to run rich, the prop and the venturi has to match each other so you run slightly rich.
I also recomend you make the tail as light as you can, the guys that built the P-7 end up having to put quite a bit of lead in the nose using the 70s 4S. Or make the nose abit longer.
You will be so impressed with the sound of the engine in this P-47 in particular. The wide body reverbarates and enhance the sound of the 4S engine, you will love it.
Martin
Edit to fix a stupid mistake