What should I gap J&E File Fit rings on a BB Chevy with Ross pistons? The motor is supercharged with 8lbs of boost and will be run in a jet boat.

I would call the people that make the rings, but you do have some variables that will add are subtract to your gap, one is was the block bored and honed with torque plates? what temp. will the engine run at? sounds like you will have a nice setup, have fun
Mark