[hiway]

Unless your motor is dead tired I figure your springs will be fine. The Z springs are a cheap and easy upgrade though. Make sure you have plenty of slot in your heads for the pushrods when the rockers are changed. Some don't. I think with your changes, the computer reprogramming will be the key. The big "killa" of your power is your tires....the gears help but those suckers also weigh a ton! Compu cam from Crane would be my next upgrade.