Very nice looking truck. I have a 1974 F250 2WD 390FE C6 automatic that I am looking to do the same swap too. Do you do the swap or know someone that does????
It really depends on your location there are great shops in lots of places that could handle a job like this. Just do your research and find a good reputable shop.
Advance adapters makes 2 different kits last i checked. One replaces the np205 input, the other uses a weaker spud shaft coupler. You can also get a Magnum underdrive to bolt between the nv4500 and np205... $$$