If your intrested in handling with a Capri pick up a hardtop. The hardtop drastically decreases body roll at the cost of weight. That can be accounted for with removing the soft-top, but doing so is a huge pain. Your main problem is going to be torque steer, the higher the horsepower you giverl the car the more its going to be a problem.
I myself am really intrested in high comp and boost, but I doubt ill ever experiment with it. Id like one day to do a twincharge setup but the lack of room makes it near impossible.