I think a lot more people are recently posting these questions about the GT30 and 35 units because they are at such a good price. Maybe it would be worthwhile making one such thread that covers both these turbos sticky.
I think R31Nismoid is on the money suggesting the GT3040 unit. I think the .82 housing is the way to go for your set up. But if you don’t mind a bit of lag the GT35R is not so bad either. On an old post on this forum someone stated that a GT3040R with 1.06 housing performs the same at the GT35R with the .82 housing. Maybe do a search and have a read as there is a wealth of info on here.
Turbo specs: GT3040R comes in .63, .82, 1.06 housings and is rated between 500-600hp
GT35R also comes in .63, .82, 1.06 housings and is rated between 600-700hp
And dude, that is one wide body skyline!