I have these headers mocked up in my 67 Camaro. I also have the original manual clutch bell crank that came stock with the SS 350. The only problem is that I don't know where the bellcrank would attach to the LS block. If you supply that (some dimensions would be great) then I can mock up the bellcrank and get a photo for you in the next few days. Here is a photo to let you know if it would be similar enough to make a decision.