Welp since your swapping heads that will make cleanup easier. On the heads your going to use assuming they're disassembled either way brake cleaner on a rag and clean up. For the lim pull the lim..degrease it. Pour some cheap oil down the drains and valleys to clean it up a bit then take some brake cleaner and a rag and clean up what you can. . Since your still putting the cam in, drain the oil so you don't have to much coming out when you pull off the timing cover. A good portion of the sludge will be gone now. Just keep up with the oil changes and the rest will clean itself out overtime.
