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You don't need to change the computer to go from 305-350. If the motor is upgraded, just have JSPerformance do a chip for you.
For injectors, you can grab stockers from an LT1 and have plenty of fuel for a mild 350.
As afar as upgrading the heads, you aren't talking about doing anything radical. A quick trip to the junkyard can yield a good enough set of heads for a cruiser engine. If you look at a lot of later LO5 (350 TBI) engines, they actually come with the same head castings as the L98 (350 TPI) you are trying to emulate. It would also have the same intake bolt pattern as your 305, so you can just swap that over.
Really, it all depends on how far you wanna go with it. What I am drawing from what you are saying is that you want a little more pep when you hit the fun peddle and a nice exhaust note at idle. That's a pretty straight forward idea to build on a reasonable budget and expect to last a good long time.
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