Frame rail question

[gdrill]

I believe the front rails along with the inner fenders are the same on 71-2 B-bodies as our Challengers. Is the firewall, rad support etc interchangeable as well? Also are the rear rails compatible? I'm asking because I have an excellent parts car here for my 70 and I want to know what I can use. The 70 is quite rusty and I want to use Ma's metal vs AMD wherever I can.
Thanx

 

[racerkilla]

I think they all the same from the firewall forward. I know 71-72 b bodies share the same firewall as an ac e body. The upper cowl is different on 71-71 b. I am doing a rail and inner fender on my 71 roadrunner using e body parts

 

[Adam]

See if the parts numbers are the same on AMD

 

[quapman]

Front rails, firewall, front floors & hump, yes.

Rear rails, cowl, no.