First, make sure the engine is on TDC on the compression stroke - not the exhaust stroke. To do that, either remove the driver side cam sprocket cover and observe alignment on the marks.... or remove the spark plugs and rotate the engine until you can feel air coming out of the #1 spark plug hole.... then align the timing marks at the crankshaft pulley.

Now set the distributor so the rotor is oriented exactly as it appears in these photos:
View from front of engine
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Overhead view from front of engine
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Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum