are you changing the turbo to a T34 as well?
if your chaning to a stud and nut kit, you'd better do the head gasket while you are there
i've been told the small turbo Escos headgaskets are as good as grp a ones, but i have had no experience of this personally
Opinions differ with the ARP stud and nut kits, i used a kit with no problems at all, but you must make sure you clean out the stud holes extreamly well. It might be worth running a tap down them and get very very clean.
with the nuts; tighten them on the studs; leave for a period; undo and re-tighten and repeat again - use the manufactures tightening torques (cant remember what they are with oil

80+nm or something like that)
i was extra careful with mine as i heard a few horror stories, so i done them up; drove the car around for a week or so and then re-checked them
everything else is a piece of piss
the chips are plug in, so no need to solder, and its worth getting a decent chip for your spec
get a crank breather system put in, as quite frankfully the standard one is shite
make sure you re-wire the fuel pump for a direct feed from the battery; again; a monkey could do it
Matt