The "CU" within the model number indicates the engine is a 1987 model, a 90? crossflow. The only V6 loopers in 1987 would be the 200hp and the 225hp model.
Emdsapmgr..... True, I should have mentioned the V4's also. I was speaking only of the V6 models and have edited my previous post to enter the V6 mention.
Edit 03/28/11: Poster's engine is a 1987 90? Crossflow 150hp V6 Evinrude.
My aplogies for the previous omissions, must be getting too old for this.