I'm not even going to comment on the feasibility of modding such a car as I used to drive a 72' HQ sedan myself in which I BARELY managed to get 16 [15L/100km] on long trips. And only if I tuned the carby to run the engine so lean it'd misfire going up hills LOL
Going downhill I tried EOC ONCE coming into Adelaide on the OLD road. My HQ had manual steering so that was fine but the brakes went away so fast I barely had time to say SHEEEEEEEEEEEET !!
But there are some easy things you could do to improve it's efficiency. change to a 4spd manual transmission. Electric fans from the wreckers should be under AUS$100. Electric water pump won't really save you much fuel % wise BUT you could try jerry rigging up your own if you're brave. Also don't forget there IS a fuel injected 202 in the early Commodore VK.
Good luck on your perilous project !
Tetsuo
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