Holley 4791 Carburetor

Hi

Purchased a 340 six pack intake and carburetors. The center carb is #4782. I am told that would not work right for this set up. Looking for a Holley 4791. Does not have to be date correct. Need this center carb for a 71 340 block manual
Don’t know if there is much interest in a 4782. Any ideas on what it is a fair price if I post it for sale.
Thanks