If your Corvette is stock, it should have L46 350, 11:1 compression 350hp Engine. Stock carburetor is a Q-Jet.

The optional LT1 was a solid lifter engine, 11:1 compression, a high-performance camshaft, and used a Holley four-barrel carburetor on an aluminum intake to produce 370hp.

In either case, I’d recommend running a tank of the best fuel you can find and a couple cans of performance cleaner (additive) and see if that helps. If not, a good rebuild on the carburetor may be in order. It sounds like something is hanging in the transition to wide open throttle. Rebuild kits are readily available, but make sure you get all the numbers (especially from the Q-Jet). If you’ve never done a rebuild, you may want to solicit some help.

Pull your air cleaner and take some pictures and there will most certainly be some folks with ideas and suggestions for you.

Regards,
Glenn