Xj40 performance build

Hello all, I’m trying to come up with a plan to make my jaguar as fast as one would expect a jaguar to be. In the process, I would like to rebuild the 4.0 and upgrade some parts at the same time. I was wondering if anyone had any ideas because I see the aftermarket section isn’t very big. And does anyone know if the aj16 head is a direct bolt on to the aj6 4.0 motor?

Leave it alone - go buy a faster car