Which body for best performance?

Ok. I personally like the look of a two door post. Like the intermediate B bodies. Such as a Savoy.
B bodies also came in both sedan and hardtop body styles.
I also always thought they were stronger cars. Which would be a win win for me.

I was looking at some A bodies and came across a Plymouth valiant two door that looked to me like it was a Two door post. Looked a lot like he old green brick.

I always thought all of the bodies were hardtops.
No.
What cars during the '67 to '76 period came as a two door post?
Darts and Valiants.
Is it possible to find a two door post, notchback barracuda?? I hope so.
No such animal.
As a final note, are two door post Mopars more structurally sound than hardtops like the rumors say?
Yes. In theory. Depends on the day of the week they were built. :)
A notchback barracuda post car would be an awesome street machine in my book.