I currently have an E31 head and E30 cam for sale on Ebay. The engine is out of a 70 or 71. Dad had a 72, and in the late 70s bought a parts car and swapped engines. The car ran, but sat in a dirt floor garage for most of its life. As much as I hated to do so I scrapped the car last year and sold whatever parts I could. I did run when I scrapped it so I kept the head. I just now realized how rare the E31 head is. It is on Ebay and my user name is Windinghillboy if interested. Less than a day left, but feel free to ask questions. I will email pics if anyone needs a better look.

Thanks.