Dunno, but a set of those Edelbrock RPMs made 787 HP on a 11.7:1 NA pump gas 451 stroker.

Two months prior to that they only made 726 HP at 600 rpm/sec on Comp Cams Dyno.

The heads flowed 287-291 cfm out of the box.

The Edelbrock Performer RPM 440 test head on 3/15/2012,

.100"......75
.200".....152
.300".....216
.400".....265
.500".....301
.550".....322
.600".....333
.650".....342
.700".....350
.750".....354