IFS is a year thing, I think in 86 they became IFS.
YN63 means it has a 'Y' motor. LN61 means it has an 'L' motor (diesel)
You'll also see the chassis number stamped somewhere in the engine bay (if the plate has been removed).
4Y is also a year thing, I think in about 87 they changed from the 3Y to the 4Y
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