$4,500 for a 2J
Then the gearbox. Priced the good 6 speed boxes for a 2J, they're nearly that price again.
Then get all new mounts and everything made, and then, since it's not the original motor in the skyline, around another $1000-$1500 or so for an engineers cert.
I'd be assuming the 6 speed box for the 2J has now come down from 6G (Where it was around 3 years ago) to a price of around $4000
So that's $8 500 JUST for an engine and gearbox, no mounts, nothing, not even in the car, you haven't even put a new turbo or anything on it.
So, looking at $9 500 basically (Excluding labour and engine mounts) to put a 2J in your R33.
You said $10 000 to $15 000 for an RB26/30 combo? I'll go a 26/30 combo then. As for $10 000 - $15 000 that's all new turbo, manifolds, injectors, etc, whereas, your 2J is still on stock turbos.