First off, your friend is a LIAR. On every single independent test,
fuel injection out performs carb setups with flying colors. Second off,
for three hundred dollars you could build one mean FI application. If
you really want to upgrade your fuel/air delivery, get a computer chip,
get some bigger injectors, and get a 52 mm throttle body. It's not
worth converting a 305 to a single carb, and I'm assuming here, that
you have very little modification done to the car already.