Tall runner here too! (6ft6 - 220lbs - 5.13 mile)
My history is pretty grim - 6ft6 and 330lbs (FAT.....people would say "but you're tall".....no, I was tall and FAT!)
Never run as a kid, got to almost 40 years old and dropped the weight by eating better and doing park runs. Got to last January (age 45) and decided to run further than 5k and get my park run down to 21 mins.
After a year of hard work in 2019 I ended with a sub 20 park run, ran a LOAD of 10k's, halfs, three marathons, two 50k ultras and about 15 OCR races (Spartan, etc)
This year I am now focusing on doing an Ironman next year in sub 12 hrs (haven't got a bike yet and never ridden on road!) - but the running training is paying off as I am just off that magic 5 min mile now...few years ago I couldn't run a mile...AT ALL!