Replacing the 650 in my 93 XP with a 720. Bought it on e-bay, was suppose to be a 650 but got a SBT rebuilt 720 shortblock of unknown year. Hooking up the cooling hoses to the 720 with 1 cooling hose hookup on the head in front and two in back is the problem. The 650 had 1 big hose in back where the water left the head, a small er one where the flush hooked up to and a bleed hose on top. The fill hose on the 650 hooked upto the exhaust pipe and I guess from there thru the engine and out the back of the head. The 720 looks like you would hook the fill hose to the back, left of head. It would come out the front of head and into the exhaust pipe then out the right rear of head. The 720 head does,nt have a bleed hose fittind on top. Does this sound like It would work? Anyone else do a 650 to 720 swap?