Anytime you start multiplying a % by a %, things can go awry very quickly.
The problem is option distribution is not uniform.
~1/3 of all 69 BB's were L78's. 1/3 of the estimated 550-725 BB pacers would be about 200 L78 pacers.
But I'm a doubter on that number. L78's were much more common in coupes than ragtops and very few L78 pacers have appeared over the years.