Upgrade From 10" To 11" Rear Drum Brake Questions

[RusTy/SE]

I'm considering an upgrade from 10" to 11" rear drum brakes on my 1970 Challenger U-code R/T SE. The car came with factory front disc brakes along with both A36 and B41 on the fender tag for the 3.55 Performance Package and 10" rear drums.

Is the proportioning valve on the firewall the same for 10" and 11"?

Would the distribution block on the housing be the same or different?

Would the brake lines themselves be different?

Thanks in advance, Russ

[Musicman]

No difference really, other than the diameter of the brakes themselves. Where are you getting the mounting plates for the 11"... salvage or new?