Mine was a GT wagooon manual. Floppy shifter but otherwise ran fine. I was rather lucky as I had zero issues with it. I found it quite a luxurious ride.
As for tyres, my general rule of thumb is:
7.0" = 215
7.5" = 225
8.0" = 235
8.5" = 245
9.0" = 255
9.5" = 265
10.0" = 275
But I did put 265/35 on R34 GT-R (18x9) wheels though