I have a 02 V6 5 speed and am thinking of doing the LS1 conversion. The price isn't really that bad in comparison to buying a V8. my suggestion is to get a used drivetrain. You can buy the drive train from Speedautomotive.com and that price will cost you anywhere from 3200 to 6200. you will still need a package that includes a radiator and gas lines whathave you. They told me the package runs around 900 dollars on top of the drivetrain. they will also do the swap for you with total labor costing you around 1400. if you do it rigt you can get a motor with only 50k or so miles on it installed and fully functional for around 6100 dollars. not bad in retrospect because a new z would cost around 24000. if you do decide to do the conversion let me know how it goes.
Seabass04@aol.com