if you have done all that work by yourself, your not a newb haha. your well ahead of half the people that post here
the gurgling means that air is somehow getting into your cooling system. one of your hoses might be a bit loose, allowing air to be sucked in, or you just didnt get all the air out in the beginning.
dont let the car get into the red...super, extremely bad things will happen. MKIII supras tend to blow something up if they overheat...they dont fare well with very high temperatures.
aer you sure the fan clutch isnt bad? and do you have a fan shroud on the car?