You should be fine. The 727 is a strong trans. I built the 727 on my boys 400 Dart and I used all stock Mopar clutches and seals. Since I worked 25 years for Dodge dealers I had a few laying around. That trans has been in the car since 1997 as it was behind the 383 first for about 6 years and the rest of the time behind the 400 which gets raced a few times a year and has run 11.40's with 3.91's. That trans fluid still looks nice and red (changed it about 2 years ago) and the trans has never had any problem. He has not driven it alot the last year so thats why I did not change the fluid last year. But it has been trouble free for 15 years and the one in my 63 has stock Mopar clutches also and it has been in the car since 2006 with zero trouble. I think you will be fine. Ron