Steve's right on the money on the Demon, keep it. If you start comparing the pieces of each carb to the other, you'll throw that Holley away.  I run one on a 408" Windsor in my pro street Ranger. It's 3 tenths and a couple miles per hour quicker than a 780 Holley on the same vehicle. Once it's set it stays set. Love it.

                                                     Frank/Rebop          

Frank/Rebop

Bristol, In ( by Elkhart)