[roadtrp204]

High HC with normal to low CO means it is running lean. If the CO was also high then it would be running rich or weak spark. The idle mixture screw should cure this if the carb is within an adjustable limit. The two best tools for adjusting the idle mixture are a vaccum gauge and a hand-held tachometer. I usually start with a turn and a half from bottom and then go in the direction that gives you the highest vaccum and rpm reading. If the mixture screw doen't seem to do anything, you have a vaccum leak. Check the four boots that connect the plentum to the four runners and the manifold to head (mine was notorious for leaks here, my tin kept getting inbetween the head and runner flange)The single progressive is a horrible setup, but I did have it on my 75 when I bought it and I was able to pass Nevada smog tests with it. Good luck!

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Chris
75 914 2.0L