There's quite a bit to it. A 2.8 V6 would be the simplest swap as they were offered stock in Pintos. A V8 requires a lot more work. If you're asking about everything involved in the swap and not just specifics, you probably aren't ready to do it. Use the search function and do a lot of research. It's going to require a new rear end, different transmission, mounts, wiring, suspension mods, and more.