What is the current thinking on the two coolant holes located between the center cylinders?  I'm having a new engine built.  The block does not have the holes but the heads do.  Thunderbird, street engine, 312 with a mild cam, C heads, .A manifold with a teapot, automatic

Thanks


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ