its a good project... original. there was an article in an old total vauxhall where some chap went a bit tit's doing something similar...
Essentially gaz has covered the basics...
Low comp pistons (MVaux do these but I've heard some bad things about them, I'm sure there is a company advertised in TV that does these too thou)
Steel/copper head gasket (lower comp a smidge)
relevant turbo (don't discount the supercharger route at this point, Eaton M62 off a mini will probably provide suitable boost and they are cheap, but then complications with mounting and fabrication*)
oil rerouting if you turbo (thinkauto)
uprated oil cooler if turbo is used (thinkauto for one of these too)
if you go for big power gains surely at least a remap will be required.
ARP head bolts
set of LET injectors
LET pressure regulator (not sure on the last two as I prefer NA to FI, but watch this space
)
uprated cam would do a world of good too, I reckon (fast road)
*once you mount the 'charger (front of block will have best room on yours) you can simply run the blower straight to the throttle body (a la turbo setup) but an intercooler will improve power AFTER the charger. The main concerns will be fabbing a mount as the Eaton range use internal oil resivoirs so no need to run seperate oil feeds, the later generations of m62 have better specs if you do decide to go down this route get the latest generation possible (should have teflon coated "screws")
At the end of the day converting an NA to FI isn't easy, the hardest part being lowering the CR to less than 8.7:1, bear in mind most NA engines develop power because of a high CR (usually 10:1 and higher) so aguably the most reliable way of reducing the CR is too change the crank changing the engine away from being high comp by reducing the stroke distance.
This will be the same however you decide to force fuel/air into the engine.
Another way of doing this is to reduce the CR to around 9:1 and run low boost, you'll still get a power hike over stock with/without NA tuning but it won't be as barmy
and lots less effort. if you can post your stroke, bore and CR specs I can calculate the approx change in head gasket thickness to reduce CR
but I do know some stuff. Im just looking for advice and also maybe some companys that could supplie stuff like a turbo and so on. The reason behind me wanting to do it is , you dont see many people doing it and i wont have to change much like the brakes and so on 
.
the book says so its 109 HP at 5800 rev/min it says lol 
. The thing is I need to buy an engine cause I need to keep my car on the road you see. Im going to do it all on the engine first so will probable have a full rebuild and so on but i was for giving up the idea but now I want to do it let me know of anythings u buy that could help me out and pm me links to stuff if they are selling in bulk lol 
