I agree with the others, I would go back to a mechanical tach drive distributor (easier than replacing the tach itself). If it's a points type distributor that you end up with, and you don't like changing points periodically, install a Pertronix Ignitor module. I have had the wiper motor off of my '72. It's extremely easy to remove (three screws). You must first remove the cowl grille, however. This will give you access to where the wiper arm mechanism attaches to the motor. This is probably the most difficult part of the procedure, disconnecting the arm from the motor.

Kevin

"The windshield wipers don’t work and the present owner suggests it could be a relay or the motor itself. What I want to know is how difficult it is to replace the motor on your own? How much do wiper motors go for? Also the wiper doors don’t work, how do you go about fixing that, or is it even worth it?"

As has been posted, you have a built-in safety feature in that the wiper motor won't turn on until the door is open. You can manually open your wiper door by going up to the vacuum actuator on the passenger side. Pull the boot aside and gently push the actuating rod in, towards the back of the car. If your door mechanism is functional, the wiper door will pop up. Once the door is ALL the way open, then go to the small bracket (an L shaped metal bracket) on the passenger side of the firewall and make sure that it is fully depressed. The hot wire for your wiper motor goes through the switch that this bracket depresses. The concept, as I understand it, is that the switch is depressed by the wiper door opening, thus preventing operation of the motor and wipers until the door is fully open. You also have a switch under the steering column that opens the door with vacuum pressure.

If you don't have an owner's manual, buy yourself a reproduction over at www.ncrs.org. Check their store for this item. Read through it and then make sure you understand how the wiper works. If you determine that the motor is bad, they are easily removed. three small screws (3/8" 0r 7/16") hold it to the firewall and one 7/16" nut holds the wiper mechanism to the back of the motor. Disconnect the three electrical connections before you start and you will find that you can take the motor out in less than 20 minutes. Secondly, I found a replacement motor at Advance Auto for around $80. It is blue instead of the bare aluminum but it works.

Your best bet is to arm yourself with as much knowledge as possible before you work on this. You don't want to buy a new motor before you find out that everything else is up to speed.
Gary