in your last pic it's the two screws at the top , that are backed by springs.(turn them in to they seat and back them out one and a halve turms to start).if you have a vacuum tester plug it onto a manifold port. set your ideal speed with the screw that is to the bottom left in you third pic also backed by a spring. start the car .check ideal speed. then check the inches of vaccum. should be in the 13 to 15 range. you sould adjust one of the two screws out a halve turn at a time to try and get the highest vacuum reading you can. also as you go, you need to keep adjusting back to the ideal speed that you want. it will increase as you screw out the mix screws. what your looking for is that highest vacuum you can get. once you fined it (mine 17 inches at 800 rpm) turn the both screws so that they are the same. (one should be at one and half, the other what ever it ended at per vacuum reading, lets say it's at three, so you have four and a half turns total, put two or so on each screw and see if the vacuum reading is the same) if not adjust both a little till you get there. that vacuum tester is a $15 item. the fewer turn out is leaner,it get better gas mileage at idlea, the more turns more vacuum for every thing. mine is at 2 3/4 turns. hope i helped.