jazarra

I have been collecting parts to start on my 92 xj and was thinking about buying a SYE from Harleys here on CF for $150, but on craigslist there is an LJ np231 with SYE for $250. mine has 140k on it, so i think spending the extra money to buy his and installing it it mine then selling my old one for as much as i can would be a really smart move. I could get lucky and even come out + if i play the cards right. Is there anything i should loook out for? would that t-case match mine?