I remember reading about this car and Holden's failed attempt using the rotary when I was younger. Holden had Torana, Kingswood, Premier and Statesman test cars fitted with the rotary but pulled the pin on any production cars due to the weak oil seals of the rotaries and the potentional bad repution it would cause for them as happened to the NSU Company.
It says in the article 181kw, it must have meant to say 81kw. Unless they used the 70s power measurement of " Oh, 181kw sounds good" We didn't see the 13B until the series II RX7s in 80/81 and they put out between 85 & 94KW standard until 84 when they had 110kw. The 86 turbo had only 133kw.
I'm off to see if I can find any Holden test data.
http://holden.itgo.com/roadpacer.html