No matter if you have the 305 / 5ltr or the 350/ 5.7 ltr.. if you have the TPI.. TUNED PORT INJECTED V8 this is the repro of the genuine set of leads... same but slightly different colour.
GM AC Delco genuine lead set is # PW210512D
TECH Help:
Chevy Small Block: #1 cylinder location is LHF -
Clockwise... Firing order: 18436572