WANTED: vintage OPS .60 zimmerman valve speed engine

Hi folks,

I am looking for an OPS .60 speed engine in new condition. We're talking about an early OPS .60 ABC brownhead or redhead engine featuring 8 head bolts and the ole Zimmerman valve. Please view the pic attached below.

I am also looking for OPS brochures older than the red OPS 1974 catalogue. These catalogues e.g. show this particular Zimmerman OPS .60 and its predecessors.

THANKS