D,
While the runners in those heads may or may not be "too big", the valves are definitely too big for the bore size. The small block is just like the Pontiac, where the intake charge will collide with the cylinder wall. The 2.05" valves are marginal in the 4.040" bore, but the 2.08 will suffer. Those heads are more meant for a 400 small block bore size (4.125-plus). But the Pro-1 is among the better heads out there.
Jim
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