Since we don't care about emissions, we should just care about how it runs. It is going to run best the way it was designed. If you get a 68 280S distributor with only advance and use that motors timing specs it might work. Otherwise nothing about the carbs change what the distributer is doing.

The best solution to the ignition box is the conversion I posted earlier, but it is pretty simple to make the dist you have work like the 68 280S one without transistor box. Get rid of the two .6 and .4ohm ballast resistors and replace with a single one with .9ohms. You will also have to replace the coil as the points won't take the current the transister coil runs on. Use the ballast and coil from a 68-69 model.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician