HOLLEY SNIPER FUEL INJECTION ~or~ CARBURETOR???

"Good start" but you also need to inspect/ repair the feeds through the bulkhead "if you have not." EMI/RFI and just plain poor connections can raise hell with EFI systems
I did not inspect the feeds through the bulkhead. Nor did I hook up the original 12 volt wire to the alternator. So now any time I use the headlights or accessories my ammeter gauge reads in the discharge range. Slightly. Fortunately I have had no EMI interference.