69/70 Road Runner

[DM69SS]

Hey guys, I know this is a bit off topic for this board, but I posted on several plymouth boards without any luck. Since I've never been able to stump anyone on this site, I figured I could at least get pointed in the right direction. Anyway - I drive about 4 hrs round trip for work about 4-5 times a month. This trip takes me through several small towns. There is a 69/70 Road Runner for sale that has been there for about 6 months (outside, of course). The price has been steadily lowered and is now at $500. It looks pretty complete, but would need a complete resto. It is sitting in primer, so who knows what is underneath. Before I stop and look at it, I would like to know what to look for. I know almost nothing about mopars and wouldn't have a clue where to start. Do they have cowl tags, engine stamp, etc.? If it would be worth it, all I would do is buy the car and sell it to save it and maybe make a few bucks. Can anyone here help me out or at least point me to a board or something where I can get some info? I'll take some pics next time I go down.
Thanks to anyone who can help.