Picture of 340/360 head porting....Mistakes?

Well, how I think of it is......
-the throat is the area where the valve job transitions into the bowl.

-the bowl is the area father into the port......closer to the end of the guide boss.
On stock as cast heads, it’s usually smaller than the throat.

The trend I’ve been seeing for the last several years with cnc ported heads is to have the max bowl diameter be close to the same size as(and sometimes bigger than) the valve diameter.

On unported aftermarket heads, the bowls and throat are often about the same size....... but there are some heads that don’t follow that trend at all(Ede BBM std port Victors being one example. The bowls on those heads are much smaller than the throat).