Swap intakes, get a fuel pump eccentric, and a mechanical fuel pump and plate (and gasket), and hope the cam is old enough to still have the 17th lobe. That's about as easy I think you could make it.
Also, your belt system is gonna be a serpentine setup, with the funky brackets and limited options for accesories. Unless the PO already changed it over, you'll be into either sticking with the wrong setup, or swapping water pumps, alternators, brackets, pulleys, belts, ect, ect, from your old engine.
If your looking for an adapter, like I said on our other chat medium, I've looked and looked, such a thing is not made at this point in time.
You could maybe dremel out the TBI intake, and drill some holes, and try to make a carb fit, but I think thatd be a nightmare of RTV and vacuum leaks.
You could have an adapter custom made like I was looking into, but that'll cost ya a bit, and still might not work well, because itll still be breathing 4bbls worth of fuel threw a 2bbl style intake.
I'd personally do the extra work, and swap intakes and everything, or just pull your engine and rebuild it. You can get a full rebuild kit for like a $100, and in a weekend, have your old 350 running like new. That is if your heads dont need rebuilding.
Good luck.
