And I don't know about this but VicRoads doesn't seem to specify that the manufacturer had to release the car with the alternative engine on a domestic market...so I think putting a B16A in an EG civic would be fine as it came standard in the Type R in Japan.

What you might also be able to do is install a B16A2 engine from the Del Sol etc into an EG because I've heard the stamp on those Aus delivered B16A2s don't actually have the "2" in some cases from what I've heard...it just says "B16A" (will need somebody to confirm this).