Hi Peter,
Regarding the full group 4 16v version:
Simo Lampinen was so quick in the group 4 Beta, that he was leading Munari (in the newly homologated Stratos) in the 1974 Rideau Lakes Rally. Lampinen could have beaten the Stratos, but the team asked him to slow down to let Munari win.
I've got some photos of the cars, but they're probably the same as you have?
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