I had a 305 with the Quadrajet 4barrel carb, like I think your talking about. I had the smog pump out the day I got it. In my state, there is no emmissions testing, and as long as you know where to go for state inspection, your ok. Those q-jet carbs are junk. I also had the airpumps and manifolds with blowdowns on my ford 460. I ripped those off that too, with no change in the performance. I can't comment on the spark plug wires, but I can say, you will have alot less junk under the hood once you switch to the edelbrok carb and headers. Once you do that, you could eliminate alot of hoses and wires and junk that takes up space and looks bad. Good luck.