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I don't think anyone makes a kit, It would be easier to just take it to a muffler shop. I put duals on my 70 4x4, the passenger side was easy but the driver side was the pain cuz the transfer case is in the way.
I bought all my exhaust stuff from summit racing, the mufflers i put on mine were dynomax turbo mufflers. It sounds good with my 360. I don't remember what the part number was on those though.
I had Walker Turbos on my 360 and liked them but after putting Magnaflows on my Mercedes 560 I'm going with them on my 390 swap. But as mentioned it is a very subjective topic...