Griggs website i would say isnt the best....
They have on there site there hole suspension set up for the early modle mustangs. You didnt see it? The 4v isnt a hard swap, just notching the towers or cut them out depending on what suspension set up you go. RRS even makes a kit for this. Only thing im sure you would have to fab is extending the trans tunnel for the T56 or which ever trans you decide to go with. Also, the mini tubes for the massive tires to support the 4.6 under the hood.