setting a dual point distributor?

I have a Mallory dual point distributor for my 310 (bored 304) how do I set it and dial it in? where can I get replacement caps and points?  

usually when you set a dual points.... you use a digital dwell meter... and block open with a piece of plastic or cardboard the other set of points that you are not working on..

this allows you to get the dwell exactly what it should be... then do the other set.. blocking  the first set open...

once you have done this.. you can then set the timing...   there are different dwell settings for dual points as one closes first, then the other, the first one opens... then the second...   this allows more current flow into the coil primary windings...  

the coil discharges the high voltage spark when the points open...

why... remember.. electrons flow from negative to positive,   when the points are closed... the current rushes into the primary windings .. the windings are wrapped around a iron core.. creating an electro magnet.. when the engine rpms are in normal driving range.. there is enough dwell time through the single set of points to fill (saturate the primary windings)   at higher rpms the time the points are closed is shorter..so there is less time to saturate the primary...  when this is not fully saturated.. there will be less magnetic field to collapse through the secondary windings...  so less there will be less current produced to discharge through the wires and across the gap at the tip of the rotor and  at the gap of the plugs... yep... 2 gaps to jump...

mallory is still in business.. most speed shops can order points and parts... as can the major suppliers.. be sure to have the distributer housing number....  that may make it easier to get the exact parts...

some of the speed shops will still have their distributer machines..  that is where the points are easy to set... my antique snap on distributer tester has dual bulbs on the display so you can actually see individual dwell time.....

this is 2009... so there is little reason if you have points... to not have an automotive digital volt meter... that reads dwell... milliseconds, pulse width, duty cycle along with ohms, volts, a diode test, and a continuity test ... ( the setting that goes beep.  for python fans)  another tool that you cannot afford.. but comes in really handy for working on cars...