Steveg,

How high was your fuel tank?
Did you use By-pass setup with Perry Pump?
What size prop?

My 91SX-H will be mounted inverted with fuel tank on CG.

So far, it is still on a test stand upright turning APC 15x8 at 8400 rpm. rich-mid range.

I will have to adjust the pump today.

Maybe I have to test it inverted before going in to the airframe.

YS 110 will definitely howl your Swallow.

Another guy is using Tower 75 2-troke standard setup and fly AMA advanced. Not sure if the plane is EX version.