Which Hemi head??

I got a set of these D5 heads which were the last of the expeimental stages back in the day. I think they are comparable to B2 heads today but hell, I don't really know a lot about the hemi yet. I was hoping to try and have someone cnc a new set for spares as these have been ported to the max. 2.39s in there. The exhaust have adapter plates on them. Dual plug holes. Like I said tho, I don't know a lot about them yet but they are old and supposed to have come off a dragster motor from Michigan. Im excited to figure it out.

20150617_195028.jpg

20150827_220259.jpg