Check/clean your grounds on the radiator support both RH and LH. The negative battery cable should have a wire going to the radiator support If not, that is causing the problem. The taillights are grounded through a different location. This site and other offers wiring diagrams which can be...
How new are the components in the distributor? Ignition coil? Module? I have ZZ3 crate engine in my street rod. The under hood heat takes out the module once a year. When this happens it is hard to start and runs like a pooch. Eventually it will not start. I also lost a pickup coil. It...