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Tom-
Like others have said, make sure you have good grounds under each light shell and all wiring is viable.
A second problem area that is often overlooked is the lighting disk inside the wire hardness bulb at the bottom of your steering column. The brass terminals do wear overtime and the brass switch contact becomes poorer and poorer. If the terminal stops are not gouged a quick polishing with some 1000 grade paper can rejuvenate things.
A leaking steering box can also reduce the effectiveness of the brass contact switch inside the bulb. The "inners" should be dry when you pull things apart. Obviously, you can clean things up but the problem will only return until the gear box leakage is addressed.
Finally, if all things are operating correctly and you want to enhance your lights there are several things that can be done. If you want to keep a degree of originality, you might want to look into the vacuum metalized aluminum coated reflectors such as Olivra (sp?). These reflectors are made with the same process used to make surgical lights found in hospitals. That is what I am using on my '35. They are somewhat "pricey" but they nearly duplicate the effectiveness of sealed beams and do not tarnish like the silver-coated originals.
Hope this helps.
Tom