Could anyone identify this carb..

Looks like a Holley 1945. It was used on 1974 & > /6s. You should be able to get a re-build kit for it just about anywhere. The kit will include a float and instructions on how to set it.

All the same, I recommend the FSM for how-to on the carb; particularly if you haven't delved into a carburetor before. The Holley Carburetors book you might find in a bookstore or on Amazon does not cover the 1 bbls.

Underhood wiring harnesses are available. There are three; engine, lights, A/C. Yr1 has them. They may be pricey, but they fit properly and color coding is very accurate.