tex,
here is a thought.
35 people at 6 oz per person plus sides equals 210 cooked ounces. for raw meat figure twice that or 27 pounds of trimed brisket.
in my neck of the woods where brisket is scarce 2 14 pounder packers would do.
time whether it be on an fec or sm150 would be about 75 mins per pound or until the thermos read around 185 to 190. briskets are like people no two are the same.
just figure 50% shrinkage from the trimmed weight and then figure in your serving size.
jack
ps. i use a temp of 225 and it doesn't matter if i am using my fec or the sm150.
pps. the houston livestock comp is my one dream comp. maybe not next year but the year after i just gotta butt heads on brisket!!!