Could my 340 block be filled?

I have run the orange box on several cars with only one failure. It went intermittent, as you described and would just quit. Cheap insurance is to carry another one, and yes, be sure the bulkhead connector is internally clean and that the connections are tight. It too will cause issues.
Hopefully tomorrow i"ll get some garage time....Had the inlaws over for dinner tonight which is always a fun time......NOT....I did take a look and my fan shroud looks to be warped and there's about a 1/2-3/4 inch gap between the shroud and the radiator...Could that be a potential cause for concern?