When I did my restoration I had dual 40's solex side draft carbs. They were shot. I swapped out to a 38/38 down draft webber.I hogged out my intake and my car runs strong and easy to manage. However, I am wondering at this point if I should have went with the webber 40's side drafts. I am running 284 cam stahl header, straight pipe and ti pistons. Too many other little things to mention. I seem to always get mixed responses. Some say with my set up I am good and side drafts is unnecessary. While others say I am losing out on top end. The one thing I do know is I don't want to sit and tinker with carbs ALL the time. I am wondering once dialed in how much up keep is required for a garaged car. Also if someone went from a 38/38 to 40's side draft and noticed a significant change to warrant to investment.