I am replacing a 318 in a 69 B Body with a 440. Year one shows a different wiring harness for a 318 vs a 383/440. Anybody know the difference? If I wanted to purchase all new wiring harnesses for under the hood including the forward light harness, engine harness, and A/C harness, who gives the best deal? is there a packagage available instead of buying all 3 pieces individually? also, what do you call the plastic plugs on the inner fenders that the wiring harness snaps into? does anybody reproduce them?