aluminium head questions

All these heads are ported but not full race ported.
The iron heads are 452.
They flow 79% compared to the Eddy heads.
The stage 6 heads flow 87% compared to the Eddy's.

The Eddy's flow the best of the 3.
The flow #'s on are bench is low.We just us it to baseline are porting work.
Hope this helps.

Marv