I don’t think I’ve ever flowed a pre-Edelbrock MP aluminum Hemi head in its “ootb” form, but with a valve job and bowl blend by Jeff at MCH...... it was 317@.700.
Normal “full porting”, no tubes 365@.700.

Without digging through my notes I want to say the Edelbrock version was right around 320...... ootb.
(Found my notes 317 ootb, 323 with 3 minute blend)

A really nice original 559 head with the seats touched up and Manley valves was 311.

The best of the stock type MP heads I’ve tested was the latest version of the 559-M head, which went 335.
The earlier version had a flatter floor and approach to the bowl/short turn, and ootb it was like 315.

Indy SR head with a valve job and mild bowl blend is 337.

I’d have to really dig deep to find some numbers on a stock type stage V head....... but my recollection is, without porting, they’re right in the mix with these other heads.

The MP Edelbrock head with a basic clean up of the entire port ends up in the 350’s.
A more serious effort, but still no “tubes” gets you another 20cfm.

A normal “full porting”(no tubes) of the later 559-m is also in the 370’s.

Full cnc port job on an original 559 head from MCH, with some tubes, right about 400cfm.

Edelbrock Victor -ootb = 400cfm
Recut seats and blend 420.

Of the “stock type” hemi heads, I like the Ede made MP heads the best.