Doug,
I am looking at the picture of your reacher and doing the math.
The hounds are about 18 ft up the mast, the reacher starts around 1 foot below. The Tack is about 1 foot above the deck level.
the foot seems to be about 0.45 times the luff length.
My guess from the picture is luff 17 ft, foot 7.6 ft leach 15 ft.

This works out to around 60 ft^2. If he sold you a 190 ft^2 reacher, I would go back and ask for the other 130 ft.

If you realy want 190 ft^2 headsail, you will need a 14 ft pole, and the head of the reacher will go quite a ways above the hounds.

Good Luck
Eric