1990 LA 360 stops running when hot (help please)

So I'm enlisting the help of anyone willing, I have a 1990 Dodge Maxi van that I enjoy throwing camping equipment in and taking off with my wife for short adventures. The problem is on hot days it will periodically not start. This is left us somewhat stranded twice both on hot days and the last time I had to have it towed home. I read somewhere it may have something to do with the ignition control box getting hot? It will restart after it cools down but on a hot day that could be several hours any help would be appreciated thank you in advance.
By "not start", do you mean it cranks over on the starter but does not fire, or it does not crank at all?