I just want to make the observation here that the people who replied have already answered your question. You had that "I want to make my Series 1 into a Series 2, how do I do that?" question, to which the answers are: No, you can't, and you should keep your Series 1 SC because it will blow the doors off a Series 2 NA. No, you can't swap the heads from a Series 2 onto your Series 1. Just keep your Series 1. You can do a pulley and an intake, high flow cat, headers and muffler, port your manifolds and eat ricers for lunch. If you want a Series 2 SC, the best way to do it is to go buy a Bonneville with a Series 2 SC.
I don't want to sound rude, but the answers are already there.
97 SE, teflon wiper blades, Dunlop Sport A-2 tires, Leather steering wheel cover, Pioneer DEH-P480MP mp3 CDRW head unit, Pioneer 12-disc changer, iPod hookup, Boston Acoustic 3 way 6x9'*, Boston acoustic separates in door pods, Alpine 4 channel amp in trunk. Magnaflow dual outlet muffler and Ractive stainless tips. Autozone rice pipe and K&N 4750 intake kit. Clear corner lights. Energy Suspension end links.