Here are some links to Ben Pearson bow information
http://www.archeryarchives.com/pearson1.html
http://archeryarchives.com/T1958.htm
http://archeryarchives.com/T1959.htm
http://www.archeryhistory.com/recurves/recurvesmain.htm
I would be careful pulling those bows to a full draw. However, if you decide to risk it, use only a B50 Dacron string. Old bows do/can lose draw-weight with age. So, considering that possibility and that your draw length is great than 28", I would scale each bow.
Prepare a shaft to the length you will be drawing on each bow. String the arrow, pull the string on a bow scale, pulling the shaft end (without broadhead) to (flush) with the front of the grip/riser. Check what draw-weight is registering on the scale.
Keep in mind, regardless of what draw-weight registers at your draw, the bow limbs may have also lost some ability to effiency use all the stored energy when string is released.
Careful!