if you include vacuum 25 * at idle is probably OK , it seems to run well ,
2 things to try here first stick your fingers over the idle bleed in the top of the center carb , if the idle immediatly improves you need to block them with solder or similar, I usually just press some solder into the blled , this way it can be removed & will not hurt the engine if it falls out , generally with a lumpy cam this makes a Huge differnce , second check you manifold vacuum at idle in gear , you will probably need a lower rated power valve Lumpy cams often run rich @ idle anyway as the longer duration misfires the cylinders cause raw fuel to be dumped out the exhaust
