Back to some Stealth numbers...
I had a set of Stealths come through the shop that had a season
of drag racing use on them. I re-cut the seats, back cut the valves,
and blended the exhaust bowls. On the intake side I opened the
pushrod pinch to 1.125", blended the bowl and also opened up
the bowl area in the roof adjacent to the guide boss, as well as
removing most of the guide boss itself.

Lift-----in/ex
.100---70/56
.200---143/112
.300---205/145
.400---249/170
.500---279/188
.600---286/201
.700---289/210

The straight wall in the intake ports on these heads are fairly
"lumpy". I think if you started out with the level of work the same
as the test above, then straightened out the lumps on the straight
wall, and took a little off the other three walls, and then smoothed
everything up, you'd end up with a port that flowed somewhere
around 295-300 cfm.