Looks a fairly tidy vehicle Shane, and judging by that blue plate on the engine bay side of the bulkhead you could assume that its been engineered with the Holden engine. The HP are a fairly old donk, first of the 179 ci engines, so pre October 1964, but they are a good donk. Was the wagon originally a six or a four cylinder, it looks it may have a mod done to the radiator support panel?
Following with interest.

Cheers, Mick.