Well I haven't seen this car in person but I had my brother look it over while on the phone. He looked under the back and said it has a drop in tank, so it is a 70. Key in the column, so it isn't a 69.5. Supposed to be all original and it has a 250 ci aircleaner sticker and factory air, so I'm thinking 5 bolt wheels(not because of the air) because it has the big 6 cyl. but as he looks under the backend he states the rearend has an inspection plate like a chebbie rearend. So did they make 5 bolt mavs in 70? And didn't the big 6 come with them? Also I didn't know that 70s had factory air with the vents on the ends of the package tray, I had only seen dealer addon air in 70s previously. He did say it has a perfect black interior except for the dash pad. And this car escaped Texas, I mean Doug missed this one.
Take a look at Charlie's guide. http://www.geocities.com/cping3/mavchanges.html The 5 lug was introduced in 1971 with cars equipped with the 250 and 302.
1973 and up....all Mavericks were 5-lug. Previous to 1973 (1970-1972) I have only seen V-8 cars with 5-lug.