I agree with EsolSI, GSR is the best head to swap to an LS block with the least hassle,the most gain for the dollar,wiring is sometimes scary to newbs but with sites like this one and some patience,you can do it. Try a simple tranny swap first,the LS tranny is great for a turbo car or a fully built torque monster.Let us know what you decide an can afford,which is the key you need first.Good luck.