Use YS 20/20. It is made by several different mfg's.
Run a couple tanks through to get the needles set and go fly it slightly rich for the first gallon of fuel.
You should not notice too much in the way of changes with the Hatori pipe, but why not just run it from the start and not worry about it?
A strong tank is recommended due to the pressure of the fuel system. We like Hayes Products tanks.

Good Flying!