The kit gives the suspension 3" of lift, and don't forget the gain from the increased tire size. Remember... CALMINI gives you "recommendations" of a 32X10.50 on 16X8 wheels with 5"-5.5" backspacing. This is the "no trim" parameters. Since I'm swapping front bumpers, and I'm not afraid of the air saw, I went with 33X12.50's on 15X8's with 3.75" of backspace. The stock tires were 265/70/16 which is about 29". There's the total of almost 5" lift.
YES... 15" wheels will fit on the Gen-1. That IS what they started with ('00-'02) if I'm not mistaken. I saved bunches of money by using 15" wheels.

Jeff!