Go to your local exhaust shop and have a custom exhaust system installed.
I recommend dual cats, and flowmasters.
Have them add the cross over pipe as well.
When I did my '82 bronco, I did 2.25" exhaust.
When I do this again, I'll go with 3" since the bends usually cut
down the flow a bit.
Headers are a pain to find, so go with something in the 80-86 range, but do this before you get the rest of your exhaust installed so that the installer can connect it all up for you.
I started out with glass packs and exited before the rear tires. I find this very noisy, but had no choice since I have a coil spring 4 link suspension on the rear.