Mad jack (original answer) has some good points. I have a 2002 v6 automatic and a 2000 ws6 m6 (how pleasanyt for you to have an endless budget). The two cars other than looks, are night and day. I too was starting to put some money into my v6. Then i realized it would never be the muscle car i wanted it to be. So an ls1 with some bolt-ons and a good tune will make around 360-370 to the wheels (look at the amount of f***s I don't give). A good head and cam package will add around a 100 more hp at the wheels.
LS1's with "some bolt-ons" and a tune now make 360-370 to the wheels? Go home Yahoo, you're drunk.