Sorry if this is off-topic, but some footnotes from me regarding Felix's Japanese article:
The article was most probably taken from Japanese Car Graphic magazine (image file name suggests), somewhere in late 1973, where the writer notes about Tetsu Ikuzawa acquired two of the said Tecno F8 engine and some spares and to be tuned by Ken Matsu'ura, later the one of most magnificent BMW and C'worth engine tuner in Japan, for the following year's Fuji GC series (a Japanese 2L sports car domestic race), looking forward to the combination of GRD S74 chassis mounted with the engine. The article also states that the sub-frame was entirely re-designed so it can loaded with wide F8 engine, and also can be converted altogether to bear BMW inline-4 instead, in case of the engine not running up to expected performance level (which happened very soon).
Later this engine was returned to Tecno as this website suggests, while the chassis itself kept racing in Japan and should be lying somewhere in Japan so far:
http://www010.upp.so-net.ne.jp/homebrew ... eg-all.htm