Looking for a little more power out of a 318

Is there a reason for that particular hp level? Most builds need a result to plan for. I use a performance window, because power output is a part of the equasion, not the entire equasion. Do you run power brakes? Do you race the car? Plans to race the car? How much money do you have for the powertrain part? IMO, you need to define the scope, before you can zoom in on the bulls-eye. There's a bunch of ways to get more power, or get the car to run faster for what you do with it.