The 140 donor engine is at the machine shop getting cleaned up and tested for cracks stripped it down and delivered it on a pallet..... I drained the oil out of the 120 that is in the boat looked good no water...and I thought that the mr 43 t ac delco was the right plug,,, but what came out was an ac delco r44xls.. not the same plug,, and tried to get the mr43t in and it wont fit,, there is no way that the mr43t is the correct plug for this engine,, I read also that NGK BR6es would work,,, seems a bit hot,, I have some NGk BR9es.. that look identical to what came out,, Im gonna go with the ngk for now, its what ive got,, hope its a hot enough spark...will consult the manual that i havent read yet....hoping to get the 120 running today,, need to make my decision to rebuild the 140 or keep the 120 for now and upgrade later to the 140.....