This is not an "ALL" years post! There were a lot of differences in the
1800s over the years and each one had different problems.
IF you have FI, then the 75 240 ignition system is not for you, but if you
have carburetors that might be a good choice.

I agree with the previous posts with the exception that I'm using very old
caps and rotors and they seem to be fine. I have found that moisture inside
the cap, surface blemishes, scratches, dirt and especially pencil marks or
other contamination that may be somewhat conductive, will REALLY screw things
up.

One problem I have faced with old distributors is that where the connection
goes through the wall of the distributor is a great place for deteriorated
insulation and intermittent grounding of the low-tension circuit. Some
appropriately-sized plastic tubing and plastic washers might be a great investment. Thus far I have been able to scrounge things up in my garage
that would work, but I have almost 1000 square feet of culch space.
(Culch = collective term for items of anticipated future usefulness)
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma