Just lookin at those pics above. I noticed the throttle cable comes around from the left. My cable comes from the right..
I'm gonna try get some pics of mine. The mower is at my dad's place.
If you have the original white square block Briggs and Stratton I believe these should have mounted on them, I think the throttle cable is suppose to go along the right hand side and around the front of the engine. This mower I have has had a Quantum mounted on it and therefore, coming from the left, is the most effective way for the throttle cable to work on it.
As the engine on mine seems in good working order, I'm going to do an oil change on it today, along with fitting a new air filter cartridge, pre-filter and air cleaner gasket (fell apart when I was cleaning carbie), so will be turning mower upside down to drain the oil and take some photos of the sunny side down mechanicals for future reference. :-)