car won't start

My friend has a 91 lx auto. A year ago or so, he’s driving to work, and at a redlight, the car stalls. he gets it started and drives the rest of the way to work. That’s the last time the car started. So anyways, his uncle comes over and looks at it, says he thinks it’s the timing belt. fast forward a year, he pretty much gives me the car. tonight i rip off the head cover and timing belt cover, this is after i juiced the battery and tried to turn it over just for the hell of it. it makes a somewhat clanking noise while tryin to start. anyways, in my non-expertise opinion i think the belts ok. so now what? any ideas? dizzy? starter? how am i able to tell if it’s the belt? any tell tale signs to check for.

I know i rambled, but any shove or push in the right direction is appreciated.
ps. 140k, never abused.

belt? is this a 4cyl?

ya, 4 cyl

same thing happened to me.check the distributor 90 and 91 had distributors that failed alot