So I fired up my new 461 on pump gas and had it timed and tuned what seemed perfectly, then I switched over to 110 octane torco race fuel and it barely runs. Will the carb need to be richened up for race fuel, all of my former engine were pump gas motors so the high octane is new to me. A little background on the motor, .404 over 454, flat tops, block decked, 215 heads shaved, 2.19 188 valves and a holley 800 dp with 81/83 jets. the engine is not really over cammed and on pump gas it would idle quite well at 700 rpm.
the only variable I changed was the fuel and it will barely idle. any help would be greatly appreciated.