There is no definitive here but I would work on creasing your cadence to about 180, but without worrying to much as it is an approximation and will naturally vary between people a little. while adjusting your cadence totally ignore your pace and run everything very easy until you have fully adjusted. You will be using different muscles and your body will be subjected to different impact forces. That means zone 2 running (which in general should be where most of your running is).
Zone4 is for Lactate threshold runs. There is some debate on the effectiveness of these runs, but either way running here should be limited. Zone 5 could be more useful training and of course should also be limited.
Awesome, thanks D.P - I'm going again on Wednesday so I'll try a higher cadence at an easy pace.