You could have the executor of the estate sell the stock and then distribute the cash to you equal to the appraised value of the land.
Regarding the tax on the sale of the stock, the stock will have a "stepped up" basis equal to its fair market value on decedent's date of death, so it may be that little or no tax is owed and any tax due would be paid by the estate.
If the stock is publicly traded, valuation should be the current market price. Valuation is generally only an issue where the stock is closely held, or very thinly traded (e.g. OTC on the Pink Sheets).
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You need to make a deal that both feel is fair. Of course the value of the stock changes daily as does the value of the real estate, although more slowly. Unless the document specifies otherwise you two will have to decide on a date for value and then live with that decison. The suggestion to have the executor sell the stock, if both are residuary heirs, will split the tax impacts of the sale. However, all assets recived a step u in basis to FMV at death so perhaps the gain is smaller than you thin,k
The answers on this discussion board are general in nature and NOT intended as legal advice. Responding to questions does not constitute an attorney-client relationship. Always see a lawyer about your individual situation