Transmission leak advise

I have a question of my own. I have a 68 Chrysler Newport 383 with a 727 there is a leak that will not stop coming from the front pump bellhousing area. I have replaced the input shaft seal as well as the front pump seal. I have not replaced the oring cuz it didnt look too bad or cracked or streched but everytime it is put in gear it will pour fluid out of the front pump. My question is can the oring being bad cause fluid to by pass it? I dont see fluid being able to come out of the vent. I realize it is possible the input shaft may have gotten torn but when i put it back together the seal looked great and no tears.