u can put the engine of a buick regal GS (1999), which is a 3.8 liter series II 240-horsepower, supercharged V6. (O-60 mph in about 6.6 secs!) My friend swapped his stock for this one. He also got a 5-speed manual tranny getrac muncie from a 2000 cavalier (his is a 98), a custom aluminum flywheel (9.5lbs) and a custom Bully clutch package... IT RUNS GREAT!!
talking about the engine... he had to make a new sub-frame to hold everything in place. Lots of measurements!! The Battery had to be relocated to the trunk to make more room under the hood. A lot of work but it is worth it! My homie is pushing around 450-horsepower 'cuz on top of all this a N.O.S. wet nitrous system is being run with 150hp jets.
So if u want power and u have somebody to work on your car, go with this engine!!!
hope it helps...!!