Hi Guys,
  I have a '46 Oliver 70HC (well, the museum does) and I am having a bugger of a time trying to get it restarted.  Its also 6-v positive ground.
  I have replaced the fuel tank, relocated the sediment bowl to the bottom of the tank, new fuel line to the carb (which has been rebuilt a couple of years ago), a new 6-volt battery, new coil, new cap, new plugs(gapped properly), new distrib. rotor.  I cannot get this thing to start.  Here's two questions I have (and please feel free to add any advice you can think of):
1. I have the new battery hooked up properly and the engine cranks (seems like it cranks slowly-but doesn't even act like it wants to start-even used starting fluid-nothing!).  The starter switch button gets hot after about 5 minutes, or so (whether pushing it or not).  What is the proper way to see if I have spark?
2. It has a Delco-Remy distributor.  If you take the cap off, there is a plastic(?) dust cover underneath-how is that removed?  I didn't want to damage it, so I left it alone, but I need access to the points and condenser.

Thanks in advance for your advice.