Should I Rebuild Carb or get a Fitech EFI system?

Hello Everyone,
Thanks for check my post.
I have a 79 Thunderbird with orginal carb on a 5.0 Ford 302 engine which produce about 130hp, which I am going to rebuild the engine to gain some hp about 220+. But for the carb part, I am enough about those old school stuff that need to adjust every week, or either they will have a insane idle speed about 2000+ when hot, and sometimes almost die at 200-300 when stop at red light.
So my first question, a rebuild on this carb will help me to address those concern? Like high idle, hard cold start, bad smell when morning, bad fuel mileage? Because a rebuild and installation will cost about $300. And also, what about switch to other brand like holley etc.

And my second question, There are so many aftermarket EFI producer in the market, like FItech, EZ EFI etc, As for my low hp engine about 200hp, I dont think i need a really expensive EFI system, which I think i will only need to get a fitech go street 400hp, which I think will be enough for this engine, and it only cost 800. And a new 4 manifold will be 300, and fuel pump etc, which will total cost about 1200-1400, and to consider there are tons of conversion video online, may be i can do it my own, or i need to plus another couple hundred for labor.

My concern on those EFI system, are they realible? Like for at least 2-3 years i dont need to often adjust or fix them?

Any ideas? Thanks!!!!

Ford 's old two barrel carbs left a lot to be desired. a 4 barrel intake manifold and a
electronic EFI would be an up grade that would be worth while!