just throw a 202 4 speed in it, im running a bog stocker 202 in my ute, its fairly loud, coppers dont annoying me, only been pulled up cause they liked the colour and told me to take care of it, I got a 4speed for $50, changed the oil and put it in, 2nd and 3rd synco's are shot, but i just take care of it,
and remember old holdens and fuel economy can never be put together
being a UC you'll mostlikely have to run polution gear, but you could get away without it,
drop tank should be fine, upgraded brakes that need enginnering with a P Plater driver im not sure about, and there was something about a 9inch diff being a performance mod but i dont see how it would be
i only find a few loops for engines, e.g i can put a commy VT efi 5L in my ute and be legal