How much power is your vortec making and where do you want to be?
If you're close to your power levels and you're happy with your engine, then I don't believe that it would be worth the expense to switch over. In addition to the engine itself, there is the AC like you said, as well as exhaust manifold/ headers, wiring upgrades and possible fuel (electric fuel pump/ return lines) that you'd need to consider in your budget. Also, depending on what you have now- things like electric fans for the cooling and intake pieces may need purchasing, too.
However, if you know that you want more power in the future maybe it's worth cutting this engine loose now and switching over to an LS (versus spending more $$ on fuel injection for your current engine and delaying the inevitable). I'd recommend a gen 4 engine (skip the LS1/ LS6) maybe an LS3??
Hope this helps
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