John,
They are '72 heads. I'm not sure of the exact casting date; they are at the machine shop right now. I was scheduled to pick them up Saturday, but that'll likely be delayed if it is determined they should be ported. I left a message at the shop earlier this morning asking them to measure the ports and call me back - haven't heard anything.
Here's a link to the Crane cams data:
http://www.cranecams.com/master/apps/porsche.htm
The lift is .462; duration is 288 degrees (!).
I checked my macho-man heads and they are ported out to 40mm. That is more than I want to run on this motor so I will save those for the hotrod. Basically, if 32mm or even 29mm will allow me to realize most of the benefits of the motor's setup, I'll probably run them as is. I just don't have enough data or experience to know...