SHELF LIFE FOR CARB?

I'm wondering if anyone can say about how long a new carb can sit on the shelf without needing a tear down or gasket replacements before running? It's a Holley, stored in original box in my garage, not heated but not bad in the mild weather I live in. I'm considering putting both the carb and a new intake up for sale, looking at an estimate of appx. 4 more years before I'll be installing the 340. I'd probably buy something for the car that is the next logical large purchase item (like a wiring harness). Thoughts?