Mine was too. Unless the heads are grounded directly to the battery. No worries if you don’t believe it. I didn’t believe it either. Someone said “hey maybe you have a ground issue” and i totally blew them off. I wish i hadn't. The wiring schematic is in the holley software that you tune with. I took my harness out. TWICE! And pinned and tested for grounds. I switched from the dual synch distributor to a dedicated crank trigger and shielded the entire harness. So much work. Also if you are running non-resistor spark plugs, buy resistor plugs. I found they made all my inputs dirty.
