Farmall Cub

and what size disk and drill could it pull

Depending on what angle the disk was set, we did pull old IH 8 foot some but the main disk was IH 10 foot full in behind a 38 G John Deere with 12 foot spike tooth harrow behind the disk in 3rd .
We used a 10 foot Oliver oats drill on high steel wheels ,in 3rd or 4th gear behind the 70. thanks; sonny

John Deere "G" is rated at 36 hp on the drawbar compared to the Oliver 70 at 22 hp on the drawbar.

7 - 8 foot disk and 10 foot drill.