Recommend a Transmission

[cp72ss]

Hello,

I am in the process of building a 72SS Chevelle and am looking for a tranny recomendation. I'd like to stay with an Automatic as the car is currently a TH400 car. I realized after tearing into my current tranny that It might be a little more expensive but better off if i looked into a 4L80E instead of rebuilding my 400. If anyone has any suggestions on who to call or where to go please let me know.

Thank you.

Chris