cam shaft selection

i had isky super cam in my 73 valiant with a 318.they offer 2 grinds:the 256 and 262.i had the 256,but they ground it with a tight lsa.it had a slight lope at idle,good mpg,and decent power.ive had no problems with any isky produts,however they are pricy and there are downsides to a narrow lsa.i was happy with the cam they made me,but there are probably better choices out there.and yes i think the summit cam will change your idle a little.