Fuel Injection - explain this to me like I am 6 years old

The Rochester model 220 TBI system is pretty easy to adapt to other engines. The typical small block throttle bodies flow about 500 CFM so it would be fine on a typical street 318. If you can find a late 80's GM truck as a donor, and do most of the work yourself you should be able to get it up and running for under $1000. Here's a good source of info "START HERE"--Fuel Injection FAQ--"START HERE"