starter check?

Battery must be known good. I'm not sure about a '71, but my '73 has the starter relay on the left (driver) inner fender. Emergency brake on hard, car in neutral, key OFF, use a flat blade screwdriver to short the starter solenoid connection (bottom of relay, toward front, 1/4" screw with a U-shaped bracket to hold the eyelet) to the large stud. Starter will engage and crank if it works.

(post being written to OP before the 3rd post from 67Dart)