Briggs And Stratton 3.5hp Classic Vertical Engine – Spares Or Repair

Was fully working when removed from mower. Mower scrapped due to rusted deck. Engine will fit multiple models, although should only be purchased for spares. This engine leaks oil, but I cannot see where from. Also, a mounting bolt has seized and snapped off inside the thread and cannot be removed. Please purchase only for spares. Please message me with any questions. Many thanks.