I usually figure 3 1/2 stops (maximum) for good detail from light to dark. This is just a quick rule of thumb. With a spot meter, I would generally place high values at 1 1/2 stops above zone 5. Another way of metering with this stuff is to just use a gray card if not sure of exact exposure. Both of these methods will get you pretty close, but bracketing (especially with 35mm) is best if there are any doubts, or even if there aren't any and you just want to play with saturation.
Reading the light contrast in a scene is the best way to evaluate a shot prior to taking it with e6. With 35mm just read a shadow and then count stops into a high value area (long lens or get close enough for good metering). If there are 5 stops of light, there will be a large level of lost detail somewhere in the image. With 3 stops, you should have plenty of room for bracketing, detail and saturation (1/3 stop). Best, tim