The final can be found at: N43º 09.ABC W085º 15.XYZ
At Mr. Brown's site: A= # of letters in his first name
B= Mr. Brown's age divided by 11
C= # of characters in the third line on the headstone
At Mr. Levi Peck's site: X= # of letters in his full name minus 2
Y= # of months in the age description
Z= The first digit in the date he died
Check sum of your numbers should be: A+B+C= 19 and X+Y+Z= 14