Many of the wires on the passenger side are related to the HVAC system. Are you still running AC? If not, clean things up with a heat only blower or a block-off plate. To eliminate uneeded wires, you should invest in a GM Electrical Diagnosis manual, found on ebay for $20 or so.
Be careful when shoving bundles through a firewall, lots of sharp edges will cut insulation and cause a short or fire.
86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior