lower floats, hotter plugs for the test, 160 is way cold-hotter thermostat, 35* advance at idle way too much. if the test is done at 1000 rpm why adjust timing at 2500
High HC on those test is usually too much advance and a lean mixture. Dial back the timing a ton and fatten it up. If CO will usually increase and HC decrease.
Yup. Look at what was done in 69--early 70's. Hot hot HOT thermostat, carb inlet heat, retarded timing and delayed vacuum advance. Long slow advance curve. Set carb on "lean" side