need under hood wiring diagram for 70 340 duster with rallye dash.

No they are the same except for the factory tach wire that is seperate and the 4 spd harness that plugs in. I have shop manuals for all years with schematics. I also have a 2 1970 340 4spd Dusters complete I am parting. Including the tach option in both . You got my number Joe.