Either way 80 pinkies are too many for 1 MBK. My Kingsnake was 19 grams when I got her and she only had 10 pinkies before moving up to fuzzies.
The thing with pinkies is that they don't have much nutritional value to your snake, even if you were to feed 4 at each meal. Better to move them up to fuzzies as soon as you can because fuzzies are better nutrition wise.
I would get the 2019 MBK and not feed him pinkies at all. I would feed 1 fuzzy at each meal.