Howdy Back:
The Holley 2300 is a great carb. It is very tuneable. It will not be compatible with your Load-O-Matic distributor. If you use an adapter you may have hood clearance issues.
Have you considered upgrading to a one barrel from a car with 200 engine. It will flow more CFM, be a bolt-off/bolt-on upgrade, and be compatible with your L-O-M distributor. The Autolite 1100 is a very easy to work on, relatively simple, and readily available carb.
Adios, David