In the above photo of trial fitting there's a white chalk mark on the firewall by the valve cover. This area needed a light but firm re-shaping with a 2 lb hammer to allow engine to move rearward enough for rear engine mounts to line up. Also chalk mark is visible on top frame rail . This area needed to be ground out to allow clearance for the 427 exh manifolds. The left side firewall & frame received similar treatment.
Once I had firewall clearance, frame/exhaust manifold clearance, I had to work out the front engine mounts. I ended up using stock replacement '66 front mounts on the original front brackets in the original crossmember & top of frame flange bolt holes. Original brackets were modified to clear the down sweep of the 427 exh & lowered about 1/2 inch to keep carb level .
I like using the original '66 engine mounting system as it provides for a 4 corner mounting system. Keeps the engine as rear mounted as possible & helps with weight bias. Plus, that's how we did it in the old days. LOL.
1966 C-10 Short Stepside HiPo Step-by-step ~ and on-going resto build in the Project Journals
