Also to add to that your breather setup is wrong and atmo blow off valve with maf sensor is not good. Both will draw in umeterd air at idle but that makes it run lean, so not really related to the fouling problem.
What injectors are you using? Did you happen to change them or other stuff when the new engine went in?
As per your first post. That's not new info.
Also it's a weird thing to say. I think you mean to say the bottom end is rebuilt? It's not a new block is it?
Plugs foul by either runing rich, burning oil or less likely too cold heat range.
You have more info on that? What do you mean stuffed around,
Do you mean the bank wouldn't loan them the money because they couldn't afford it and it was a bad idea?
When did you buy it mate? What else did they tell you about the car?
Did they tell you it will attract chicks cos that's a lie, everyone knows gtr's attract the blokes. Not that there is anything wrong with that.
Haha. You really are going struggle mate. Best of luck with the beast when you get it. Hope it's not too rusty and hasn't done 500,000ks {odometer will show between 70,000 and 140,000 regardless)
Is the car you are getting an auto?
Good luck with trying to find a good used exhaust in America. If only there was a way to make one.
I like how your thorough list has intercooler on it twice. Seems like you are really doing your homework.
Also please keep in mind looking to have a dependable 28 year old car that is going to also make more power than stock and that has had the speed wound back a couple of times is a fairly unreasonable ask.
They aren't the target market.
There are also people that need to be able to tow 3500kg everyday. Doesn't mean every ev needs to be able to do it. Short trips are the most common.