The P's are a good head. Depending on what your future mods are. For example, if you are gonna go supercharged or turbo, I would hold off and get a set of afr, trick flow, or edelbrock. If not, the P's will do just fine for you.
Like was said, you need an intake to go along with them. With a little portwork they are a surprisingly good head. If your staying NA you might want to have them milled as well.
I agree with everyone else. They are a good head if you are on a budget but there are a lot better heads out there. Have you tried looking for some used trick flow or edelbrock heads? I would say AFR but I doub't anyone has a used set for sale.