I see a lot of great opinions and thoughts in this thread I'd love to quote and add my two cents to, but there's just to many to quote them all. So I'll go at it like this. I completely agree that it is a better idea to keep what you have vs swapping one way or another, there aren't enough good benefits to make a swap like that worth while.
That being said I've worked on a ton of carb'ed GM engines, and TBI, more so back in the day. The biggest issue we saw with TBI was lack of understanding them and I think that to some degree still holds true. In a carb'ed vehicle for people use to carburetors it is generally easy to understand what problem causes what symptom, with modern fuel injection the slightest thing out of parameter and the system sets a code. But with TBI the computer systems were not so sensitive, so you could have a rig run like crap with no check engine light and the mechanic not knowing what direction to go in, but in reality the TBI system is very simple and reliable. To me the biggest benefit in the TBI system is consistency and less maintenance, which might not matter for all but in a daily not having to tweak the carb, or change the plugs as often is a benefit.
I'm rockin' an 84 C20 with 305 edelbrock the former owner put on. It runs right and good. Would I rather have a Q-jet yes I would, but will I remove a perfectly good carb to do it. No. And although I would prefer TBI to my carb, I'll never convert, not enough benefits given the work involved to do it right.
I would encourage the OP to consider selling his truck to someone that would like TBI and buying one that is carbed already. If you insist on the conversion please do it the right way. Get a carbed parts truck and put make it as close to factory conversion as you can unless you plan for a custom fuel system. Please do not be the guy that tries to regulate down the TBI pump pressure for the carburetor and don't use some sort of adaptor to adapt a 4 barrel carb to the TBI manifold. That will only lead to heart ache and pain.
