Just one suggestion: When a chromed engine has a good pinch when cold, you should get it up to running temp (rich side of peak) as soon as possible. Running cold puts undue stress on the rotating parts. By quickly bringing it up to operating temp, the conrod, etc. will break-in smoother, with minimum wear. This will also slow down the wearing away of that pinch.

This is only valid for the first few minutes. After that, the rotating parts are worn in and it is what it is. Time to put it in a plane. I think most engines continue to break-in a bit for up to an hour of running time. After this time it should run stronger, smoother, and with better fuel economy than when first started. You might want to tweak some final carb adjustments at that time.

Of course this is only ONE way. There are others.

George