Fuel filter location

str12-340 said
Every 1970 Dart with a 318 had the original fuel filter between the end of the fuel line from the tank and the fuel pump.

I wonder if the OP's car has headers that put one of the pipes too close to the filter or the metal fuel line...

If it were me , I`d find a diff. coil to compare w/ the existing one , switching them out for a try would be easy . Coils have been pnown to break down after getting hot ------------jmo