1985 Chevy Silverado failed my last two ca (test only)smog

2nd of 2 smog test: @ 15mph/rpm-1012, %CO2/meas-11.9, %O2/meas-0.3, HC(PPM)/max-133, gp-321, meas-285, CO(%)/max-0.89, gp-2.19, meas-4.53, NO (PPM)/max-1090, gp-2057, meas-441, results-gross polluter, @ 25mph/rpm-1290, %CO2/meas-12.2, %O2/meas-0.3, HC(PPM)/max-104, gp-271, meas-271, CO(%)/max-1.12, gp-2.42, meas-4.12, NO (PPM)/max-1030, gp-2114, meas-588, results-gross polluter, note** Before this test I had a full tank of gas, replaced w/new spark plugs(bosh fusion ir plugs), spark plug wires (8mm quality wire set), dist.-Cap(accell best quality hei type), rotor(accel best quality), PVC valve, oxygen sensor (bosh oem type), air filter(k&n) cleaned and re-oiled w/k&n recomended kit, replaced oil filter(k&n) and oil(quacker state q-series full synthetic), ** ***also note also that I drove my truck to smog station 3 miles cold and was not driven for the last month after failing my first smog test.***
My question is this: What path foward should I be taking regarding to components of my trucks smog emmision sytem should I focus on and or seek expert assistance with? Does the information above indicate an straight forward process should I follow.? Thank You kindly for any assistance your able to provide, Micahel