Yes it is the 143 tooth wheel. I have the BB bell/used plate & disc & throwout bearing/slave cyl & linkage along with it that I bought in one pkg deal. I can trim the input shaft or drill the crank flange & use the roller bearing & that only leaves the balance issue. I would assume that this is 60's stuff & would go on an internal crank but I dont remember who I bought the stuff from & what year or years he told me the stuff was off of. EDIT I do have a 400 & it looks like I will be getting the 440 back from the 1979 motor home I sold.