Belt routing

[flip66]

A friend has an 85 c10 it had a V6 4.3 in it and he has replaced it with a SB400 and is trying to use the same crank and fan pulley along with the same ac, alt, PS brackets but the belts will not line. The ac is on the passenger side and the alt is on driver’s side. The ps pump has a double pulley one it that the ac belt runs through then to the crank and up the fan. Could some one tell me the order the belts are on there 85’s his is the ps goes on first being closest to the motor then the alt belt then the ac last. The problem is to me it looks like the alt goes on first and lines up with the back grove on ps pump then the ps pump should go on then the ac. If someone could post a picture or a belt diagram that would be great.