1971 Dodge Dart 318/904 trans ***CAMSHAFT OPTIONS***

Comp XE256H

Or, a Comp 20-306-4

And a set of 901-16 springs........and new valve seals while you’re in there.
I have the exact same setup as the OP and this is what I went with. I called and talked to Comp, also used their online program. This is the cam they recommended and I'm VERY happy with it. If compression was higher then a XE262H would be good, but the torque the XE256H puts out is excellent!