1. Pull the sleeve, count the holes in it.
2.In my limited experience:
More ports = Higher Rpm, more topend, usually thirtsty. 7-9 port.
Less ports = 3-4 port. More torque, better fuel economy. A few engine types have found a way to use 4 port mills and still get plenty of topend. (ex:NR+4,Vspec.)
3. I like turtles.