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Very neat pics. But I don't think the first pic is a B20 - there's an exposed 'intermediate shaft' belt drive showing (the cam on a b20), and the distributor isn't in the B20 spot on top of the oil pump drive, but forward in the OHC position. So that one is probably a B21/3 DOHC head.
Also, after a little digging around, I found some more pics of that last head. Apparently it was made by Weslake. There are a bunch more pictures here: http://www.saunalahti.fi/~holset/hipo/
But apparently it isn't made for a B20 either, but for an OHC block. The bottom isn't wide enough to cover up the unused pushrod gallery, and the 'special' bolt hole which serves as the oil feed to the head is in the OHC position, not the OHV pushrod position:

OHV engines feed the head through the center bolt hole:

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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)
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