I ordered my LIM gaskets from Advance tonight, should be there in the morning. They are still the plastic ones, as they don't have a upgraded set for the 4.3. But hey, at least the dexcool isn't in there and won't harm them.
Yeah I didn't switch it, the previous owner did, they fully flushed it and put green in it. There is little to no dex left in it. I do have pitting on the LIM, and I hope it does not leak, but I don't think it should. I will probably smear a little gasket sealer around the pitted area before reassembling it.
Also I noticed, that the new gaskets don't come with front and rear gaskets like the 3800 does. Apparently I just glob a big bead of black RTV on the front and rear? The stock way was with a gigantic bead of RTV.