If such rural agricultural land was sold for the purpose of Agriculture, then it is out of the ambit of Capital Gains. If the same was sold for the purpose other than agriculture land, then in your case, it will be taxable as Long term Capital Gain.
Computation is as follows:
Sale Considration = 10,30,000
Less: Selling expenses = Nil (Deduct if any, since you have not mentioned anything in this regard, i took it as zero)
Net Sale Consideration = 10,30,000
Less: Indexed Cost of Acquisition = 86,480 (10000*1081/125, since you have just mentined 1984, i took it as FY:1984-85)
Less: Indexed Cost of Improvement = Deduct if any
Long Term Capital gains = 9,43,520
Less: Exemption u/s 54EC = xxxx
Taxable Long Term Capital Gain = xxxx
Tax Liability u/s 112 = Taxable Long Term Capital Gain*20%
Hope your doubt has been clarified...