67 Barracuda Gen III swap

I have a 1970 Dart I'm doing a 2010 challenger 5.7L hemi swap that comes with the 5 speed auto "nag1" I bought a ECM from Efi source I got the Gen3 ms3 goldbox with harness for plug and play, the owner told me I have to ditch my factory transmission that came with the motor off the donor car, I was wondering if they made a stand alone TCM so I can use that transmission, also I saw you say we can use the stock k member to drop the hemi in, what more would be needed to drop it before I go the TTI header route, milidon oil pan, amTTI motor mounts, and QA1 k member? Also if you have more info please email me! I need help this is a car I wanna build for my baby boy I just wanna get most out the way now.
To run the Gold Box, yes, you have to ditch the Nag. I have heard of a company, Sound German Engineering(I think this is the name) that is doing stand alone for the 8 speed Torqueflite. Possibly the nag also? I do know to run the Nag, you need a LOT of parts from a donor car. Search Hotwireauto.com for this Info. To use the stock K member you'll need Milodon pan, TTI engine mounts, a remote oil filter system, and 2010-2012 5.7 Jeep Grand Cherokee/Durango manifolds. The Jeep manifolds have a smaller 2 1/2 inch outlet. The Durango has the bigger 3 inch. How they snake down is identical. I have a thread on here with some pics I did of my son's 73 Scamp.