I just looked on LRS's webpage and they show the pulley from the side so you can't see the lip.
The pulley you get really should have a lip. You could try and tweak the pulley alignments if you wanted. However, without interferance from your new pulley, if the belt sits perfect between the alt pulley and PS pulley, but the belt is not sitting over your new pulley perfect, that suggests the wrong pulley to me.
I have found that I have to go to 'the good ol' parts stores to get what I need (we have a great one that still has rows of books rather than computers, since half the 94-95 parts seem to be wrong in the generic parts' store computers).
Though a pain, trying to get a more correct pulley will probably save headaches down the line (that's a real long run across the front of the motor, which is why [I believe] the pulley should have a lip).
Good luck bud.
Oh yeah, FWIW, LRS sells the pulley for about 18 bucks (that's where mine came from).