You could, but I would not bother. There is nothing inherently wrong or weak with the 67 down idler cantilevered beam design. Your problem is the cheap or worn out idler arm. I run that design on my 66 Barracuda and on my 67 383 K Frame, but I use a kit to make it a Roller bearing instead of a rubber bushing. I've run this roller type idler arm since the 70's and it is still good.