Transmission debacle

Hey guys maybe someone could help me with a decision and possibly some insight. So i have finished my 340 to 372 stroker engine and i have 2 transmissions.

1. Unknown status 727 transission that came with a 340 block i picked up, was told it was a runner.

2 . 904- picked up unknown but was told it has been rebuilt, it was behind a 318 block i had picked up years ago


So im trying to decided on whether i rebuild one of them just so i know they are good or just run them as is? Kimd of dumb question but unsure on my next step on this. I do love 727s but just unsure