Mopar ECU box

Is the case to the ECU grounded really well? I think the HiRev 7500 from Jegs, FBO, Rev-n-ator, or the Standard Motor LX101 are pretty common replacements or moving to a HEI module, MSD etc. will be recommended by others as well. Mancini sells replacements as well. Finding good boxes with longevity is difficult these day. I keep a HiRev in the car as a back up to my Chrome box.