727 or 904

You guys have been brainwashed. The 904 is fine, with a 5 disc front clutch it will take anything you can throw at it. The 727 is a big block and a truck trans. The 904 would hold up to most any big block too if there was a case made for the BB bell housing pattern but there isn't.

Quit fooling yourselves and leaving horsepower and weight savings on the table. All the Ford guys run the C4 which is a 904 copy and the GM guys use TH 350's or powerslides. No one runs a TH 400 anymore, it's overkill, like the 727.