question about valve stem seals

I would go with the Felpro set for the street and the positive seals if it's just race. Sometimes positive seals on the street don't let enough oil on the exhaust valve, valve stems this can lead to valve guide wear or a stuck valve depending on the valve to stem clearance. Race engine run for a very short time and you don't get as much heat in the heads and block but the street engine runs longer and idles for extended periods of time. Also there is no vacuum on the exhaust side but there is on the intake side so the positive seals help control burning oil by preventing vacuum from pulling oil into the cylinder and fouling a plug. Does this help at all good luck no matter which you use