1) The limited slip additives won't hurt anything. 80-90w is fine. There's probably some anitfoaming agents in the oil, but the foam you're getting is not at all unusual. It indicates water in the oil, usually from years of accumulated condensation.
2) 5qts go into the transmission/differential through the fill plug ahead of the shifter. For the final drives, they take 1-1/2 quarts each, for a total of 3 qts. The fill plug is on the inside of each final drive, ahead of the axle, in the casting maybe 1/2" above the lip of the pan. Unless they've been replaced, it should have a recessed square head. (Same size plug, I believe, as the fill plug on top of the tranny) This is where the pointy snout on the quart bottles of gear oil comes i handy to nurse it in there. Correct level if just topping off is until it just starts to run out the fill hole.
3) Over filling the tranny can cause a leak, even from a good seal. The seals in question are in the sides of the tranny box, right where the differential shaft passes out to the final drives. The seals are made to hold residual oil on teh shaft, not to hold back a reservoir of oil, so even a good one on a good shaft can leak some if overfilled. A bad one will leak in any event, and the leak will appear from the weep hole at the botttom of the final drive on the left or the inner end of the diff shaft housing on the right.
To prevent overfilling (you could have a quart's worth of sludge in the bottom of your tranny and dumping 5 quarts of new in will over fill it), use the level check plug. It's on the side of the tranny, at the left front. The brake rod is probably in the way, but you'll see it. Pull that plug (should be a square head) before filling and fill from the top just until it runs out the check plug. If you've got a known five quarts of oil to put in, any you have left over once you reach the full point will give you an idea of mow much sludge you have in there.
4) If we're thinking of the same weep holes (the two I described above and one at the outer end on the right, where the final bolts up to the diff shaft housing, no, you dont want to plug them. They're weep holes. They will accumulate crud, especially if you have any oil leaking from the seals at the tranny or the seals where the outer ends of the two differentail shafts (A significant leak from the seal on the final drive indicates a seal in need of replacement). Just take a hook or a wire and keep them open. Worst case in plugging them is that any oil leaking in from any source will puddle up and could saturate your brake linings, so keep those holes open.
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