Cisco 460ford.com is a wealth of information, I have two 460 projects going together.
I understand the purpose of your rig is grunt, a couple things you can do on the cheap would be to go with the ARP rod bolts, the stockers on the majority of these engines are not exactly performance related.
If you have any other cylinder head casting than DOVE-C, and they are actual 460 castings not 429 some minor work cleaning up the bowls and removing the hump the EGR deal makes in the exhaust port will pay dividends, as will port matching the intake manifold ports to the heads. If rally have some $ to spend the Edelbrock or SCJ aluminum heads offer some serious out of the box improvements, and they drop 65 lbs off of the engine.
I think if I were in your shoes I'd do the airbags now while you have so much access to the springs and framerails. Do the whole shebang, the little compressor and separate lines...it makes for a lot less hassle if you are in the sand or soft dirt and just need an inch to get level without unhooking the truck, or need an inch to get under it to hook back up..push button instead of grab shovel, and you can dead-nut the ride height as well.
I love mine.
