I have a 280Z with a newly built LT1. I love the car but if I were going to start all over now I would go for the LS1. When I built my car two years ago the LS1 was twice the price of the LT1, that's not true anymore. The LS1 is just a better engine, lighter being all aluminum, more HP and a much more sophisticated ignition system that does not use the dreaded optispark. $2900 is a good deal if it includes the whole car. You could sell what you don't use and get a lot of that $2900 back.