You might have better luck going to the OHC Cammer forum when looking for a motor. Occasionally they pop up on eBay but be careful when buying that way.
http://sohcsix.yuku.com/
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69 OHC ZH Sprint Hurst 3 Speed 3:55 (1 of 213)
99 Valkyrie 1520cc Flat 6 108hp/110tq - For Sale
http://sohcsix.yuku.com/forums/1/OHC-lounge
Wanted: 1969 OHC "H" Camshaft