National Tire and Wheel is running a special on some of their lifts. Check this out if you're interested in the Fabtech.
http://www.ntwonline.com/04-08_FORD_..._P8223C185.cfm. You might be able to find a better price somewhere else but this is a good one I think. Their special is 10% off the price shown plus free shipping. So it ends up being like $1900 and it includes rear shocks.
Don't be scurred into thinking the ATZ's arent aggressive enough and won't get you through mud and dirt very well. They have just as aggressive a sidebiter as the MTZ's and they really are an aggressive tire. Do what you want but I promise you that the ATZ will be aggressive enough and will be a lot quiter than ANY mud terrain.
If you check out the pictures I have in my gallery you'll see what a 35x12.5x18 on 18x9 combo looks like. Again, your choice between 18's and 20's. If you don't plan on ever going bigger than a 35 I would say go with the 18's but if there is even a smaller doubt that you may want bigger then go with 20's. The MTZ's are more expensive than the Toyo's if I'm not mistaken.
Good luck either way! Shoot me a picture of that 71 Mach 1 when you get it if you're still on this damn thing!