Agreed, that's what we did. Main problem is if you don't keep the retainer EXACTLY centered when releasing the spring compressor, it will knock off one of the keepers. You can't exactly see what you are doing with the engine in the car. Engine out of the car and on an engine stand is another...
The only issue I have with the modern valves is installing the keepers when the engine is installed. Original keepers are much easier to install. Granted, not something you do very often (hopefully never).
I bring this up because recently a member's car stuck a valve and we had to remove it...
Here is the thread I think you were referring to. That was 11 years ago. https://www.fordbarn.com/threads/carburetor-13-32-deep-well-socket.160740/ Haag hasn't beed on Ford Barn since 2017.
Isn't a Harley carb a side draft, not an up draft? If so, you will have to fab an adaptor/elbow.
i once saw a Pinto that had Honda 4 cylinder carburetors. Looked cool with 4 CV carbs.