I THINK THE EZ WIRING HARNESS YOUR TALKING ABOUT WILL NOT RUN THE ENGINE, BUT WILL WIRE THE CAR FOR YOU SUCH AS LIGHTS IGNITION... YOU HAVE THE COMPLETE WIRING HARNESS FROM A TRANS AM I DONT THINK YOU NEED THE EZ HARNESS..... I RUN A EZ HARNESS TO WIRE THE CAR, AND I BOUGHT A AFTERMARKET HARNESS FOR THE ENGINE... YOU MIGHT HAVE A PROBLEM GETTING THAT TRANS AM HARNESS CONNECTORS TO GO TO YOUR 1937 CHEVY SWITCHES AND BLINKERS ,, THE EZ WIRING WILL HOOK TO THEM....OPINION,,, GOOD LUCK