These are supposed to be going on a MP 575hp(?) crate motor that already has stage 6's on it.
Those come with the 509 cam and he's running 1.6 rockers, and doesn't plan on changing the cam.
He also didn't want to have any intake fitment issues or replace the pushrods if possible.
As such, the heads were only milled enough to equalize the chamber volumes between the two heads, and get them under the 90cc spec....... I went for 88cc's.
I used the same springs that come on a set of Edelbrock RPM heads and set them up at about 145lbs on the seat....... Along with Comp Cams 10 degree retainers and locks.
Metal jacket Viton seals, spring cups, and SI 2.14/1.81 stainless valves.

Finished flow numbers:

Lift-------in/ex----ex w-2" tube
.100---71.3/61.5
.200--149.2/115.9
.300--211.2/157.8
.400--267.4/179.3
.500--306.7/193.2---221.1
.550--319.7/199.3---226.8
.600--318.6/205.4---236.2
.650--320.5/209.8---241.9
.700--321.6/213.9---248.3

If you look at the last pic, you can see that after milling the coolant hole plugs pretty much disappear.

As far as stage 6's go, these weren't that bad at all to do. They usually kinda need the guides replaced right ootb, the seat depth variation is usually around .060, with the chamber depths(and volumes) varying about the same amount, and when they have the monster sized guide bosses they require a fair amount of extra time in porting.

The date on the box for these was 12/96, so it took 21 years for them to be finished and ready to be used.