O.k., I'll take a stab at this, since I've done the same thing with southern peas in the beginning.
You'll need at least a 50 foot row. I sqeezed 50 foot of southern peas into 25 foot of row by planting in a zigzag pattern down the row, 6 inches apart. Now it all depends on how prolific an Anazasi bean is and how many you feel would be worthwhile. I was able to get enough to freeze and cook fresh out of this row.

You may get a better answer on the Bean, Pea & Other Legume forum.

A 50-ft row would give you some to eat and a good idea of whether you wanted a 150-ft row.