Wow, I never heard of that happening before (crank pulley)
And as far as your exhaust manifold leak, I had the SAME exact problem with my car. In fact, I bought the car with the "leak" and I did the SAME exact thing you did, bought a turbo gasket set (because it has to come off) and bought an exhaust manifold gasket. When I pulled the exhaust manifold, turns out the last person to bolt it on overtorqued 3 of the nuts/studs and stripped out the aluminum threads in the head. I spent 4 days installing 3 10mm helicoils. I really hope your problem is just the gasket and not what I went through, but it sounds very similar to my problem. My car only made 4psi of boost with that "leak".