None, since there can be no conversion. A pound is a measure of mass. A peck is a measure of volume - in the US a dry measure equivalent to 2 gallons. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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A peck is a unit of capacity and can vary by weight. A peck of feathers would weigh less than a peck of apples.