The timing marks are on the plastic lower timing cover.
I believe it's on the driver side of the master pulley about 1 o'clock.
The index is usually white, but the paint tends to wear off.


1995 Trooper LS auto 3.2 DOHC /w SOHC intake
1989 Trooper 2.6 auto
1989 I-Mark RS DOHC 1.6
1991 Stylus XS DOHC 1.8