So at a glance, it looks like the sump and head have been off judging by the red gasket goo, that is fine on the sump/crankcase cover but I hate seeing it on a head gasket. If it was mine i would see if it has compression, if it is good i would be pulling it off and cleaning it up with a new gasket. they are easy and cheap from you're nearest mower store.
I would also just check the Cam timing, just to be sure, otherwise these engines are very simple. i would recommend a new gasket between carburettor &block. It appears you have the governor spring (very important), and before you try and start it make sure to adjust the governor. I cant see the throttle & choke linkages. if you dont have them you should be able to find them at you're local briggs dealer 2nd hand.
otherwise it has electronic ignition, just make sure you have the kill wire on it
