WOW!! Overwhelming response. Thanks to everyone for all of the information, opinions, and resources.
I need to be honest here, hope it doesn't disappoint anybody, but I don't know if this machine is a keeper yet, and I would not be willing to put in the amount of time and effort that some of you have put into machines unless I was sure that it is a keeper.
This was my first EM. It's a beater that I bought because it was cheap, local, and in decent shape. I bought it with the idea that I could cut my teeth with this machine, so if and when I got the "coveted" EM, I would have enough experience to feel confident working on it. For my history with it, here is a post when I first picked it up.
http://pinside.com/pinball/forum/topic/my-1st-em-19720-small-piece-of-history-included
I've got it running good mechanically, so now it's time to do all of the playfield maintenance that hasn't been done to it for years, or decades. I think at this point I'm going to everything that I can do to it to make it a nice player's machine, but avoid doing anything to it that could make a full restoration, including clearcoat, more difficult. That's in case I decide it's a keeper, or if I decide it's not, so the next owner down the line won't have any unforseen problems if they decide to do a total restoration.
I thought I would need to get a set of primary acrylics and try to mix for color matches, but after reading Cliffy's link, maybe I can find near matches already mixed. I'm going to try to paint the insert rings that are dogged up freehand or make templates, and there are two gudges (I know it's not a real word but it's a real word to me) from the kickout holes. After painting, I'll cover the insert rings with wax and cover the kickout hole gudges with mylar and play the heck out of this pin. If I decide it's a keeper, you folks have provided enough info that I would feel pretty confident taking this on as a full restoration.
Thanks again to everyone for all of your good responses!
Hutch