low vacume

After my first startup/cam break in, the carb needed rebuilt due to old gas. After carb rebuild it ran much better. I am around 12 before on my timing. it still loads up at idle and will occasionally spit back through the carb. The quick fuel carb has 4 adjustment screws and with my vac gauge on cant get more than 10lbs. The gauge says I should be between 19 and 22lbs. Not sure what springs are in the msd distributor. or what I should have in. I am using msd 6anl box msd coil msd mechanical advance dist. Any ideas?? oh ya I'm using a 7717 eddy cam,could that be why:banghead: