oil fill location? i swear im not retarded...

[bufmatmuslepants]

so uh, just went out to change the oil in my truck for the first time (just bought it a few weeks ago) and i cant figure out where to put the oil in. the passenger valve cover has a rectangular breather on the back of the cover a little smaller than my palm, and the driver side valve cover has a plug kinda with 2 tubes coming out, one going to the carb one to i think the air pump under the driver headlight. i can pull both out, and looked for the rockers and springs but couldnt see them. i think there aftermarket valve covers because they are chromed, but they are really really rusted and look really old. its a driver side oil dipstick. i took pictures if you guys think im nuts and ill post them if nobody knows. thanks.