offset placement installed small block

I used two equal thickness metal plates and was able to get them to slide between the inner fender (where it's closet to the manifold) and the manifold itself. The plates fit so good that if I moved them forward just a little they would get stuck when they hit the raised numbers (4th pic) on the manifold. The two plate together had a width of exactly 5/8" and they fit with maybe .005" -.0010" clearance. My car has stock motor mounts in the stock position. I tried to fit the plates on the rear raised portion of the inner fender but they wouldn't quite fit in between the fender and the manifold so use the front raised portion of the inner fender so that you're in the exact same spot where I measured.
If you need anything else I'll do my best to help.

treblig