Hi, Can anybody give me some advise on this carburetor. My friend offered me this. It is marked Model S, it also says S 41 B, it has the 4 bolt flange that I know Winfields had but it also has 2 larger bolts outside of that flange. I am sure this is an up-draft style. Is this a good carb to run on a B motor? and also, I want to pay him a fair honest price for it, what should I offer? Thanks!