904: should I switch to 727?

I had a 904 (998 / 999?) from an 85 Fifth Avenue in my car behind 300-ish HP for around 15 years. It was rebuilt with good quality stock internals and still had the lockup converter. I beat the living hell out of that transmission on the street and never broke it. Then I put installed an earlier non-lockup 904 and had it rebuilt with good quality stock internals, and I beat the hell out of that for 5 years before pulling it in favor of a 46rh.

Keep in mind I wasn't really racing the car and only driving it around 3000 miles a year.