1h20min self transfer in Stansted airport

We (a group of 7 guys) are travelling to Morocco in mid March. From Amsterdam to Stansted and then a connecting flight to Rabat. We land 15:20 in stansted and fly 16:40 from Stansted to Rabat. Is this doable? We only have carry on lugage and will probably get fast track. We'll also be sitting in front of the plane so we get out faster. How are our chances of making the flight looking?