To get a supercharger, you'll need to consider a few options:
* Universal Kits: Look for a supercharger kit designed for a small-block Chevy V8 of similar displacement (the 305 is a small block). Companies like Vortech, Paxton, ProCharger, and Edelbrock offer these. You'll need to be prepared for significant fabrication and custom work to adapt the kit to your specific vehicle. This requires mechanical aptitude and/or the services of a professional mechanic specializing in engine modifications.
* Used Market: Websites like eBay, Craigslist, and specialized forums for Chevy trucks might offer used supercharger systems. Be very cautious when buying used, as you'll want to ensure the components are in good condition and compatible with your engine.
* Custom Fabrication: A high-end option would be to work with a performance shop specializing in supercharger installations. They can source components and fabricate a custom system tailored to your 305 Vortec. This will be the most expensive option.
Before purchasing *any* supercharger system, research the specific kit or components carefully. Ensure it's compatible with your engine's specifications (intake manifold, accessory drive, etc.). You'll also need to consider upgrades to fuel delivery, exhaust, and engine management to handle the increased power output. Improper installation or insufficient supporting modifications can damage your engine.