Seen a few now in early cortinas, they are cheap as chips given the price of early commodores. You might struggle with the sump as they have a front sump but other than that, it should fit without any problems.
Some will not like the fact that it is a Holden engine, yet we are happy to run Volvo calipers on or BMW discs, Toyota 5 speeds, Holden uni joints, hilux diffs with Alfa discs and Nissan calipers on Saab rims.
It is your car, do whatever you want, most of all, enjoy it.
Shaun