Why would a carb not be easy to use. The truck is being driven in Florida which rarely changes temp
Brutha, I'm in Canada. I know about getting carbs to run well in hot to cold temps.
Nothing wrong with a carbed engine. My comments are more towards trying to "hybrid" a predominately electronic vehicle with part old tech and part new.
You're going to need standalone spark control, probably standalone cruise, standalone transmission controller and probably a few other surprises like cables, fuel pressure and pumps, regulators, etc. I'm not saying it can't be done, just that a 98 vortec truck is probably not the best starting point.
I would suggest getting an older square body that came with a carb and the options you want, or gut the drivetrain in the truck and run something like your 383, carbureted, HEI+spark box and a TH400.
Cheaper, easier to set up and much more robust. If you're tickling 500 hp on a 4L60E and a ten bolt you're asking for trouble.
That's just my personal opinion though. If you want an electric trans and a carbureted engine go to 'er!
I would suggest a 4L80E instead with 500-ish HP on tap though. They make standalone controllers for 80E's for around 500 bucks.
Cruise and all the rest is going to be a bit of a challenge though.