enough boost is when you have 3 dimple marks in the hood from the valve cover nuts..
I did the same thing you're contemplating except minus the motor mounts. I'm pretty happy with the results so far. They definitely seemed to tighten things up. I did use the provided lube, they still squeaked at first but that stopped after a month or so of driving.
I can't recommend the motor mounts, the denser material transferred the engine noise into the inside of the car big-time! They came off in less than 50 miles.