head casting number 4772576?

Thanks Rumble,
First thing is that I bought these heads 4 years ago and put them on a friend of mine's 318 needless to say they were too large for the little engine, so I built him another set of heads and they were 318 castings. this helpeed out his little engine greatly, and swapped him out of these heads as he had no use for them.
But here is something I found interesting about them, well first they were under the P# P5249574 and are no longer available, but don't fret they still have a small valve version of this. They were under these P# P4529269, and P5249768, and now they are under one # P5007950 and list for $510.00 ea. bare, they also have 46 in Detroit. For a comparision I used Edlebrocks 6077 head as the Eddy's are 163 cc's intake runner and the chambers are 63 cc's and the exhaust are 72 cc's. These heads are 161 cc's intake runner, 62 cc' chambers, and 60 cc's exhaust. So I thought this was close enough for a good comparision, the flow #'s are below and both are out of the box heads.

Eddy's
2.02/1.60

Lift Int./Exh.
.200 138/153
.300 200/179
.400 228/190
.500 242/201
.600 248/205

now the iron heads from Mopar
2.02/1.60

Lift Int./Exh.
.200 164/156
.300 205/176
.400 228/185
.500 241/188
.600 232/190

The other thing is that the Eddy's have been minorly gasket matched from the factory and these haven't and also that the Eddy's have the bowls cleaned out and these don't. So IMO I would say that these have greater potential than the Eddy's do for performance, and they aren't old castings. They also have thicker decks on them than the old irons do so durability shouldn't be a issue.
I thought that maybe some of you would like to see what Mopar has done and no one ever hears about. I would bet that they would sell alot more if they just advertised them. IMO I would look at Mopar first and see what they have that would suit my needs and then look else where if they didn't have what I was looking for.
This was just something interesting that I had never seen posted before, but figured that some might like to know.