In general,the traditional Hillborn mechanical injection is not user friendly for street use.
Rob,There's lots of info on the various throttle bore injection systems adaptable to older engines using GM TBI componets and after market control boxes,Megasquirt?
Holley and Edelbrock make port and TBI injection for V-8's.And I think some are universal and may be adaptable to inline engines,about 2 grand when all said and done.
Injection won't necessarily make more power but it can be more effecient at part throttle,especially port injection,on modified engines.And port injection doesn't require a heated intake manifold for good in town performance.That's good cause it lowers the detonation factor if you're running high compression ratios.
