i've done far too many of these actually hahaha
ok, as smithy says, in the EK the firewall just on the corner needs about 1inch extra removed or bashed or whatever you decide.
extractors i used red motor ones and modified them to suit but whichever way you go you have to modify something in that area ...
easy way to fix the fuel issues is to get a centre punch and hammer it into the side of the fuel filler neck and punch a hole in it, then go to your local auto shop and get a 5/16 barbed fitting and some flux and solder and solder it in, note you need a good high powered soldering iron for this, but it saves welding a fuel tank and it doesn't cop any pressure so its all good.
fuel pump, try to get it mounted nice and low so it doesn't have to suck too hard to get fuel up out of the tank.
i also found the battery tray was in the way so i just re-located the battery to the boot and cut the tray out....
as far as the mounting of the engine goes, you will need to remove the dowl pin from the back of the crank and then use all the clutch setup from your current engine and then 5 speed should bolt on..... lash out and get a new spiget bush while your at it - come to think of it a full clutch kit might be a good option while the lot is out!
on the subject of gearboxes, make sure you block off the vaccum fitting on the front of the manifold which normally has the gearbox modulator connected to it (trimatic)
i've found the easiest way around all the vaccum hoses was to remove them and just have the hose go straight from the bottom of the throttlebody to the dizzy ....
now one other thing to think about, if you swap the motors over you need to meet the emissions for the VK motor, however if your current 202 is in good condition it might be worth putting the vk head on it and then you only have to meet the emissions for that block.
thats about all i can think of off the top of my head, but if you have any questions i'd be glad to help if i can, and i have plenty of wiring diagrams and such if you need them.
here is an idea of what it looks like in the EK Wagon ...
along time ago i actually did a bit of a tech article on putting the vk efi into an old holden ... have a look here
http://www.oldholdens.com/tech/eficonversion/ and have a good read, it will most likely answer alot of your questions.
smithy - pm sent!