IMO there's no point in using a standard tank in any C/L model, whether you fly stunt or anything else. As PipeMajor has said, that type of tank will always start the flight rich, run O.K. mid flight, then go lean towards the end. All my C/L models use uniflow tanks, even scale and sport fun flyers. Uniflow tanks will deliver a consistent fuel flow right through the flight. I position the uniflow pipe near the front of the tank, makes the engine lean out just before the tank runs dry, so I get some warning.