[1930-fordor]

When I first got my model A, I ask about the same question to a fellow that had over 100,000 miles on his car.
His advice to me was carry a spare distributor.
Drop it in your car and set the timing and make sure it runs well. Put it in your box and have it ready.
We told me 99% of break downs will be in the distributor. You can change one in five minutes and get back on the road quickly. When you get back home you can see what went wrong with that one. But no need to sit on the side of the road any longer than you have to.
I did burn up a coil one time, by leaving the in the on position, so now I carry a spare coil.
As far as tools, I do Cary a basic tool box. And every time I get a tool off the rack to work on the car, it goes in the tool box. After a couple of years of working on the car I have accumulated a very complete tool box.
I have complete gasket sets with extra head gaskets and lot of spare parts. I do this for a couple of reasons, I don't hesitate to jump in and drive 1000 miles away from home. And also when our club goes on tour, I may be able to help someone else.
My mind set is one of a boy scout.