Rebuilt top end of engine now carb idles much higher?Please help

So I did more research and possibly I’m not understanding how to set timing properly. If the avg factory initial setting for a standard 383 Mopar at idle is around 12deg BTDC does that mean that the timing is advanced 12 degrees? It’s advanced because it’s occurring 12 deg before the piston on cylinder #1 is at the very top of the cylinder before it begins the journey back down on the power stroke? If thats the case then the timing marks on the cover will show that it’s firing about 12 deg before the zero mark on the timing cover. This will show up on the dampener as the mark is 12 deg counterclockwise before the zero on the timing cover? Should the setting on the timing gun be at 12deg as well? To advance the timing further you turn the distributor clockwise which is the opposite direction of the engine rotation. As a result the mark on the dampener would show up further back counterclockwise on the wheel. Do I have this correct. Sorry about the rudimentary questions but I’m trying to learn.