I just checked my Unionville Hobby catalog. They have an 84" Cub J-2 for a .35 -. 60 2c or .45 - .65 4C engine, but no Super Cub kit. I might have been thinking of their Turbo Beaver kit....
Anyway, I built one of their small (72"

Beavers last winter and I love it!
It flies very well with a .40 2C. Nice kits at a great price. With the
Canandian/American dollar exchange rate, it's a bargain price.
Good luck in your search