Yes there's a dimple on the front of the sprocket as well as the notch on the back of the sprocket as shown in the photo. Looks like he's got the timing on from the pics. If the truck wont run I would look for another culprit. Plug wires all in the right place? Theres no crank angle sensor on SOHC 3.0 so its not that.

when doing the T belt I always go by the sprocket not the pully. The plastic cover could get distorted by heat over time and become innacurrate giving you a slightly false reading. In my opinion you should always install the belt utilizing the mark(s) on the sprocket(s). Also since the pully is Keyed to the crankshaft theres no way it can slip barring a broken key which you would have spotted upon dissasembly so I would eliminate that possibility from the equation.

99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..