i could do it pretty well in the skyline (and i'm 6'3), but in the pulsar i had trouble with shoes on.
it also depends on what you want to heel/toe for. if it is for burnouts at the drags then you shouldn't have an issue (unless you wear skate shoes or boots). if it is for track work, then try to track down some cheap race shoes, or anything with a not too sticky sole. if it is just for on the street, then just lift of the brake, dab the gas, and apply the brake again if you must make yourself sound like a fool.