Are the headers attached to the engine already? If so, another option may work. You could always install the mated engine/tranny/headers on the K-frame while it is out of the car and then lower the body over the loaded K-frame. This is how I installed my big-block/tranny/headers. No scratches.....
This is what I used.
http://www.summitracing.com/parts/aed-7200?seid=srese1&gclid=CjwKEAiA9uaxBRDYr4_hrtC3tW8SJAD6UU8GMiEZSpiHKlIfzKrL3zUbMQi8H9w8_20zJ8NhQh-cxRoC7oTw_wcB
I would call them. I cant imagine they dont make one for your car. These weld in along the floor pan. Mine took about 8 hours to do but they fit nice and the difference is noticeable.
Check this out. http://www.forabodiesonly.com/mopar/showthread.php?t=71277
US Car Tool makes what you are looking for. There are also some guys here on the website making custom kits.
http://store.uscartool.com/mopar-a-body-frame-connectors.html