[Tom Goldman]

Your Sun Dist machine uses a switched input to trigger the strobe coil, the same way a coil on the car is triggered .
the output from the MSD is not suitable to trigger an older Sun machine ,you will need to build a converter to convert the clipped AC output from the magnetic trigger to a switched ground output.
I'm pretty sure there was a site on the internet with plans to construct one.
It really is a very basic circuit , or you can go to MSD site and access the instructions for the distributer. They have instructions for changing the curve. .