Pulley Alignment

Post refers to a 1994 Jeep Wrangler 4.0L HO MPI engine w/o AC

I completely rebuilt the engine top to bottom and dropped it in my 85 CJ-7 as a conversion to replace my tired 4.2L engine with the carter carb. Obviously, all the pulleys and accessories came off for the rebuild. Re-installed the alt, power steering, harmonic balancer, water pump pulley and idler pulley.

For some reason, the serpentine belt walks off the pulleys "toward" the engine block. I thought it was the harmonic balancer, so I replaced that. No luck. My thinking is the power steering pulley since that's where all the adjustments come from. Plus, it looks a little off to the eye.

What's the best and most effective way for a backyard mechanic to make sure all the pulleys are aligned properly?

Any help would surely be appreciated!