Pulleys got me pulling my hair out
That said, the crank & WP grooves don't appear to line up, unless it's a phone-cam trick. The 'double-sheave' on the Alt./Crank would also go around the A/C if equipped, 2 matched belts. From '79 F-body FSM, & pics of My '87 Dakota V-6....
Alt./Crank/A/C(or idler stand-in) are innermost (2) grooves, P/S next groove out, Air Pump farthest out.
As A-body Joe below says, they work as a team, or else expect to do some work to make it work.
Where's the air pump bracket, are there washers to stand-in place of it? That may skew the PS some.(EDIT...NO)
That said, the crank & WP grooves don't appear to line up, unless it's a phone-cam trick. The 'double-sheave' on the Alt./Crank would also go around the A/C if equipped, 2 matched belts. From '79 F-body FSM, & pics of My '87 Dakota V-6....
Alt./Crank/A/C(or idler stand-in) are innermost (2) grooves, P/S next groove out, Air Pump farthest out.
As A-body Joe below says, they work as a team, or else expect to do some work to make it work.