Ron Fuel Injection makes cost effective throttle body kits, throttle assemblies, fuel pumps, & other parts for both normally aspirated and supercharged engines; and EFI setups with HALTECH engine management systems.

Excerpts from their site to common questions about fuel injection:

“WHY SHOULD I SWITCH TO ALCOHOL (METHANOL) FROM GASOLINE?
… makes the car a more consistent performer.
WHY SHOULD I CHOOSE ALCOHOL INJECTION OVER AN ALCOHOL CARB?
… mechanical fuel injection does not utilize a venturi (restriction) to draw fuel into the engine … Without this restriction, and with no heavy fuel to deal with in the intake …
WHAT INJECTION SYSTEM IS BEST FOR MY APPLICATION?
… can be outfitted with the correct sized throttle body to work on virtually any combination …
WHAT ELSE DO I NEED TO PURCHASE?
… RONS prices their systems as complete units.  These kits include the throttle body, combination barrel valve/fuel shut-off, …
ARE USED SYSTEMS A GOOD DEAL?
… in most cases the system will need parts replaced or changed for your particular application …”

Click on http://ronsfuel.com/faq.cfm for the details.