How to build a good tbi 350?

hi i'm 17 years old and i'm restoring a 1987 chevy truck. The truck is supposed to be a 350 tbi but it is carbureted idk if the engine was motified for the carb or is a whole different engine. The motor is worn out and im going to remove it and im gonna replace it with either a 1977 block which i would rebuild or a 1988 tbi motor. I really like the fuel injected motors but i want to build it into a mild 300 horse engine that can haul trailer loads of scrap and firewood and have some fun offroading and show off a bit around town. I've been leaning towards the 77 block because there seems to be a lot more aftermarket parts out for carbed motors but i really don't want to give up on the fuel injected motor. I like how it makes some really nice low end torque. Either engine i will have bored 40 over and after that i really don't know where i should go with the tbi motor. i have the 77 planned out but i'd like to know how to build a good low to mid range rpm tbi motor and im open to any suggestions thank you.