727 Build for Mid-10s

My understanding is that the drilled drum is recommended for transbrake applications, which this particular build isn't.
In your original post you said you did not want to have to take this trans apart again. You also said this is a street and strip car.
In John Copes video he says some recommendations are common to both manual shift and some are just for a transbrake. As I said in post 77, if you are sure you will never want to run a brake, you can build for manual shift only. I just wanted you to be aware that if you do decide later that you want to run a brake, you will have to disassemble the trans to do specific transbrake mods.
As far as the vent, leakage or not, to comply with track rules, and ensure your own safety, a catch can is now required. You cannot hook it up to the factory front vent, transbrake or not. So you might as well move it now if you ever intend to go to the track. Imho