Back in the day , Chrysler and most everybody else said , minimum of .080 on intakes , and minimum or .100 on exhaust . This was for performance engines (dragstrip) , but "DONT FLOAT THE VALVES very hard , if at all !!!
I always went by 0.080 minimum on intakes, 0.120 minimum on exhaust. I was always insane (7200 rpm plus) and I never hit an intake at real close to 0.080, but I did tap the piston carbon on one exhaust valve at 0.109 clearance. Just a data point to consider.