What are the pros and cons of it compared to a normal single dist. 12a?? I just saw this the other day and thought it was pretty neat.

pros;



its COOL.

the carbon seals are easy on the rotor housings, so these are actually very easy to find

any 12A intake bolts up





cons;

the 5mm apex seals are hard to get, so it best to upgrade to the later 12A rotors, still use the carbon seals though

you wanna use the later stat gears too, etc etc.

and its got points, although i guess Mr Hannover used to convert to crank trigger, and the guys around here put chrysler picups in the distributors



they have a different engine/trans bolt pattern, so get the bellhousing too

The distributors operated the same. The single distributor had 2 sets of points (1 for leading and 1 for trailing plugs) running off of a single shaft to the engine where the dual distributors had a single set of points each (1 distributor ran the trailing plugs and the other the leading plugs.) and each ran its own shaft to the engine. I've driven both and there was no difference in power, reliability etc. I don't know why they switched other than because the second distributor might have confused some mechanics who didn't know rotaries and it simplified manufacturing.