A guide that I've found very helpful for someone in my situation has been the actual mopar performance book for the Drag Pack Challengers.
If you dont start with a core motor, you will have a ton of parts to order from the dealer to get the whole thing together. Very few hardware store bolts will fit this motor, so it's easier to have a complete core motor or a good list of parts.
For all my mopar parts, I've purchase from Matt Deane at Glendora Dodge in California. He has been a great help and even knows the swap like the back of his hand.
He made finding and ordering all of the parts a breeze. My local dealer was no help, and if I needed 6 bolts...they wanted me to buy 12 or whatever their minimum was to keep the items from being absorbed into their inventory. Matt sold me what I need and the service was great.
