Yeah I'm going to flip this 280z and thought while I have it, I (Could) do the swap, but it sounds like it's not worth the hassle. I dont plan on changing out the original L24 in my 71 only adding triple webbers..Should be fine, and yeah more weight would not help any. I didnt realize I needed to change the mustache bar and all that.
I do like the idea of the limited slip from a LSD. But for now think I will just keep the original rear end. Thanks fellas.