I would suggest you get a manual on the Holley carburetor. Something similar to this:
https://www.amazon.com/Holley-Carbur...31472083&psc=1
This book may or may not cover the Holley 2300, but this carburetor is just like the front half of a Holley 4150.
You should be able to get a carb kit base on the LIST number on the choke horn. Then set it up in accordance to the manual.
I would also recommend getting a manual for the truck. It will be educational and helpful when you need to work on it.