None.
An acre is a measure of area in 2-dimensional space, whereas a [linear] foot is a measure of length in 1-dimensional space. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid.
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70 feet! The answer is in the question!
An acre contains 4840 sq yards, or 43560 sq. feet. A 70 x 70 ft. plot is 70*70 sq feet, or 4900 sq feet. 4900 / 43560 =~ .112 or 11.2% of an acre. 1/8 acres would be 12.5%, and 7/64 would be 10.9% so there's no standard fraction that satisfies this problem.
70 acres = 3049200 sq feet. So, if one side of a rectangular area of 70 acres is 1320, the other side is 2310 feet.
70 acres = 283,279.95 square meters.
70 kilometers = 229,658.793 feet