To revisit the volume rebuilder 452's....
As rec'd-

Lift------in/ex
.100----67/52
.200---118/97
.300---169/129
.400---196/141
.500---217/145
.600---222/145

Recut seats, back cut valves, blend bowls, open pinch to 1.040-

Lift------in/ex
.100----68/60
.200---139/109
.300---201/146
.400---244/171
.500---259/182
.600---255/188
.700---255/190

With the 2.14/1.81 valves installed, the later (346 and newer) heads really respond well to a little blending work.