Skylark: I certainly found over the years how every modification improved performance. That's why when it comes to giving an honest answer to this forum I always think back to the late 70's when I owned a 302ci XB Ford Fairmont GS. This car had everything except grunt, but I soon took care of that - thanks to bolt on modifications made by dealing with the right people. From then on I knew I had the best of everything! If interested, click on my pic to enter my garage, scroll down and click on the Fairmont to check out the details/mods.