If you are not too far along in the installation of the wire loom you could send it back and get the correct wire loom for a V-8. You may find that other parts of the loom are not correct for the components also.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine