If you measure from the center (curve) of the front trigger, or from the point where a double trigger would have been located on a single trigger gun; and can measure 13" of stock wood to the base of a rubber pad or butt-plate, most collectors will not penalize value because a one pad will bring LOP back to at least 14". Anything under 13" will impact desirability in most cases. A proper restock is very expensive, but this is a scarce gun; so I'd certainly keep an open mind unless the price is totally out of line. As far as chokes, the gunworks would have bored those barrels full and full unless ordered otherwise; and as chokes are seldom marked on the barrels, have a gunsmith measure constriction to make that determination. You should also measure chamber length, for if this is an early example they will measure shorter than today's standard 2 3/4" shells; and most likely 2 9/16.