ecu box problem

I agree. Its a shot in the dark with the china made electronics. I purchased a set of speedmaster aluminum heads. My machinest said they were not bad at all for an eddy copy once we change the guides out for better ones. You are def better off with a factory spark box. I have seen some pix on fabo of the chrysler spark boxes gutted out and HEI 4 pin modules inserted inside, and wired up to the spark box pins. Interesting solution. Also cracked open a jaguar XJS V12 spark box a neighbor was having trouble with his car. New box from Jag was $250. Imagine my surprise when after digging the potting compound out i found a standard GM HEI module inside. We went to the store and bought a replacement module and fitted it back into the jaguar spark box for about $25 LOL.