See if this forum thread helps:
https://forum.daysailer.org/forum/viewtopic.php?f=12&t=6142It appears that all the Proctor masts were a bit different, no standard, so you'd going to have to figure it out. Generally, the topmost sheave is the main halyard (should be obvious), and the outlet sheave right under the forestay is the jib halyard. Spinnaker sheaves all depend, but the standard is for both the spin halyard to be a few inches above the forestay and for the topping lift (if there it's moveable at all) to have a pulley somewhere around the hounds (spreader). Where it all comes out is up to you, there may be halyard exits at the base of the mast and/or at cuddy roof height.
If you have to put in new exit plates, consider that you may want to route line UNDER the cuddy, but at roof height.. right below the roof, leading to the aft "lip" of the cuddy. Also, I'm a big fan of Racelite hardware:
http://www.racelitehardware.com/stainless-hardware/exit-plates-and-fairleaders/ (shameless plug, no I don't work for them, just like their stuff).
Good luck!
Tom