Rear end identification...

POPS6T6 said

I zoomed in on the pitcure and I think you are right, there does appear to be a one there also. Thanks so much! Wasn't sure which case it was, and to be honest, not sure if 741 is good or??? It was on the donor car when I bought it and planning on dropping it soon and rebuilding it and or replacing gaskets, whatever is neccessary..

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Well I found this website http://members.tripod.com/mojo_page/chry875.htm
and it breaks them down pretty good. "1-3/8" small stem pinion (aka. '741')
Carrier casting numbers: 1820657 (1957-1964), 2070741 (1964-1972).
This assembly was typically used in low weight/low horsepower applications through low weight/medium horsepower and high weight/low horsepower applications.
Pinion depth and bearing preload is set with shims. "

Now I wonder if I that will work with my drivetrain, 360 and 727 transmission right around 400hp? Or is it possible to put a bigger case on that rear, and if so, would that also mean new axles and so forth?