Good morning All... I have a 67' Coronet with a 318 that came with a 2 bbl that needed to be replaced. My son bought, and installed a new Holly 4160 and a new manifold. The engine runs great. very happy with the change out. However,,, The car no longer downshifts. We hooked up the linkage just like it was. I was wondering if someone can advise us on how to readjust the downshift rod to accommodate the new carburetor?