It's kind of considered middle ground for a street cam, above this level each step up you generally tend to start really trading bottom end power for top end power and gears stall starts to become more and more necessary. Obviously not set into stone.
Depends on the person. IMHO that is getting a bit more duration than I would want for a street 318. To me 220° @ 0.050" is about the max for a street 318. As you are aware a larger displacement tollerates or likes more duration and lift.
Personal preference and expectations vary widely.
