I'm a little late on this as I recently joined but the 330 C135 will not fit the Super A because the bellhousing as Jim told you (Good to see you over here too Jim
). If it were from a 404 it would fit in a 140 though as it would match on the bell housing and the new style water pump and accessories up front. If you really want a C135 in the Super A you need to switch over to the new style accessories and get a 140 radiator as well (which would require a Super A-1 grill and gas tank since the 140 is taller than the Super A). Also a C135 from a power unit should fit as I think they all came with the narrower bell housing but not sure on that
The C135 is a strange beast as there are two flavors based on the insides (early vs late 330/404 diff crank journal sizes and 9 vs 14 bolt heads) and two flavors based on the outsides (narrow and wide bell housings). You also need to watch because some crankshafts are not drilled for the pilot hole that the clutch shaft needs.
If you want to boost the Super A a little go for a head/manifold/carb/air cleaner from a 140 and put a new sleeve set in your existing block (either 3-1/8 or 3-1/4 overbore depending on whether you have the 251069 or 354898 block). If you are parting out the 330, it should have the same 9 bolt head as the 140 so you could use that, but not sure on the manifold and the carb would be a force fit. That head has a smaller chamber, larger valves and larger ports than yours.
Hope that helps...