UZS131 Crown (89-90) has midsump, 220cc injectors (or 215, who knows), and tight manifolds of stainless steel (exhuast)
UZS141/UZS151 Crown (91+) has front sump, and better headers
LS400 is same as 91+ Crown
SC400 has rear sump, 251cc injectors and better headers.
They are the major diffs. There are smaller diffs too, but they are less important.
Post 1997 is VVTi