idle questions

OK here is where I'm at I have the valve cover off and need to know what I should set the valves too cold just to try and get it running. so I can adjust them while the car is running.
I will also remove and replace the intake anyone got any suggustion on an intake NAPA, O'reilly's who, what, or which should I look for?
As far as the Carb, how do you check the float too see if is too high? Idle mixture screw as set at 2 1/5 turns is that two high if so what should I start out at?
The only thing that bugs me is that the car runs really good at speed it just will not idle worth a crap. lLike the first post only get it up to 450 max on the RPMs
Side note where can I get bigger valves from I was pointed to a guy on ebay but he is out. If I'm going to be doing all this work I want to get started with head work so I can change my intake to run my dual single barrel setups. then I will have all the issues for two carbs instead of one HAHAHAHA.