Unfortunately you have a Windsor with press on cam gears. They'll have to remove the front timing cover which will take the most time. The Romeos can just remove a few things up top and using a cam gear tool not have to remove the front of the engine and deal with timing.
S1 can keep the stock valve springs to. If you were going for S2 would need new valve springs. I understand removing and installing valve springs is complete hell, Nick did his cam install and didn't have anything good to say about that part.