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fuel injection is not really that hard to install on an older chevy. used tbi units can be sourced cheap and do really help. the hardest part is getting them to work with your application, for example
my friend bought a jeep grand wagoner. it routinely got between 7 and 9 mpg, no matter how hard he had his foot into it. long story short, we found out some one had swapped the 360 out for a 401..... but we took a tbi system out of a 92 1 ton truck found an adapter plate and adapted the sensors, and it is a really sound truck. starts year round, it now gets a solid 14 on the highway and seems to get 10.5 in town. everything was off of a 454, it also gained a hell of a mid range and kept the low and upper it had before.
now i dont know how much can be attributed to the fuel injection or if the carb was sized or tuned wrong, i never saw the carb, but the easy starts alone were worth it. we skated away with everything for $250. that said for you it might be even easier. like take the whole manifold and bolt it up and everything after that might be plug and play
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