My 360 Engine is running reverse once turn off.

The lightest,most volatile gasoline components boil as low as 95*F. The heaviest are close to 400*.
The more IDLE-timing you give your engine, the faster it will idle. And vice versa; the less Idle-timing it has, the slower it will idle.
The only way to change what you got is to dick with the speed screw.
Or
The best idea is always and forever will be, to set the transfer-slot exposure below the primaries to between,
square to a lil taller than wide, set the mixture screws in the center of their range, then set the idlespeed with Idle-Timing, to in the range of 500 to 750
What actual numbers you target will depend on your combo.
Like @crackedback, and others say, 12 to 14* is a good starting point and without taking the carb off to look, will get you in the ballpark.

My 10.7Scr 367, pushing 180 psi
starts just fine even down at 8 or 10* advance, and running a minimum coolant temp of 207*F; click,vroom-vroom. I don't mess with the Transfer-slot exposure. I retard it electronically.
But I imagine if I only had 125psi, it would be a different story.