Getting the fly-by-wire electronic 90mm throttle body that comes with the newer LS engines to function in your hot rod is not as tough as you may think. However, if you're old school and like the idea of running a cable, you're in luck since many companies are now making 90mm throttle bodies. In addition to Holley, FAST and several other companies offer high-flowing throttle bodies. Best of all, they bolt right up to your factory intake just like the factory ones, and if you need to suck in more atmosphere, they even come in larger sizes. Just make sure to try and size the throttle body to the intake as best you can.