My uncle used to own a Honda dealership a while back. As a result he has a couple of shelves of NOS Honda parts in his basement. On one of the shelves is a brand new cylinder head with complete a valvetrain.

The dealerships I've called have been less than helpful and I haven't found anything substantive with google, so I'm hoping someone here might be able to help me out with identifying it.

 

I think that is an old prelude head. From the bastard B20A's and such

 

Post more pics...

There will be a code on the front by the exhaust ports.

 

it has the dual distributor option. hahaha....