[Ross F-1]

After your 500 mile break-in, my recommendation would be to get a Merc 4-bolt manifold and run a Rochester 2G. Much better design, easy to adjust power valve, and excellent parts support. You'd want the early small-base 2G, it has the same bolt pattern as the Merc manifolds.

I have an Innovate MTX-L AFR mounted and it is invaluable for seeing where your mixtures are.