Hey, I noticed your old post from last year.  I too have an Oliver, a 1946 Industrial which is pretty much like the Standard.  It's the only one I can keep while married, ha, ha, so I too am trying to mod it for some/any kind of pulling.  Did you move ahead on any bore increase or dual exhaust?  I have the standard Zenith carb (100000?) with 6-speed.  -Joseph in RI