race to pump gas mix and converter stall?

so i'm probably gonna be running my 340 around next summer on the street and wanna know what you guys think I should do for mixing race fuel with pump gas non ethanol premium to be exact on the pump gas. Not familiar a whole lot with race fuel let me know what the good stuff is. the engine is a 340 with x heads, super victor intake 850 cfm demon, cam is RX302S-R6 comp cams 302/309 269/276 at .050 .654/.655 lift. 106 lobe separation. has 11.5-1 compression. custom ross pistons. also what gear ratio would you guys recommend on the street with a 4500 stall converter. i'm going to drive this car quite a bit. gonna have 26x9.50 hoosier dot slicks on as well.