Your way off, the days of the northstar are long dead, the caddys have gm small blocks that are rated as the best overall engine.
I had a 96 el dorado with a northstar, and never again. I had 3 different mechanics tell me the northstar was quite possibly the shittiest setup ever made by GM and its damn near impossible to work on. I had a timing belt go out, and they had to drop the engine just to get to the pulley to change the belt. Also went to replace the water pump, which should have been a 5 minute job, but the northstar's have a cheap ass housing for the water pump and the tabs that hold the pump in just snapped off. Come to find out, GM doesnt even manufacture that housing anymore, i had to go to every junk yard in vegas to find one.....yea fuck northstars