Dont blame ya Bernie..them Victorians are a mean bunch, specially the ones with them funny motors.
Re Heaters...Mate for what it is worth I scavenged the wreckers...ended up with heaps of stuff with heaps of leaks, or stuff which had little to no heating capability.
I did want good a good demister with fair interior heating ability.
Eventually got pi$$ed off and went with a Vintage compact heater demister. Model 50615-VUH.
http://www.vintageair.com/download/pdf_singles/27.pdf
I mounted mine on top of the tunnel behind the dash..two 2" pipes for demisters, and a vac operated trap door which lets air into the cockpit. Three speed blower which would compete with the worse Melbourne storm you can imagine.
Got it from TCR Components in Melbourne 03 97203006
Comes in a kit...blower/heater/demister unit...control switches..solenoids..wiring etc. Was good value considering what came with it, but i'm damned if I can remember how much it cost me...mind you..I did modify the top of my tunnel to give me a lil more room for it.
You all take care