I installed a 97 Vortec 350 in my 84 Suburban. The exhaust bolts on the manifolds were sheared off. I attempted to drill them out without success. I was looking at installing some shorty headers, but since the 84 frame is narrower than the 97, I was not sure if they would fit. The stock manifold has a heat shield that only misses the frame by about 1/8 of an inch. Has anyone used headers with this engine swap? Did they fit? Does the frame need to be ground down a little for clearance? Should I just go back stock since it fits?