Farmall Cub

Does anyone know what is the minimum size/HP of a tractor is needed to make a International 420 Baler work?
I'm assuming that a 540 PTO is needed to turn the drive shaft on the baler.
Of course I prefer a International Harvester Model tractor.
Any help is greatly appreciated.
Thanks in advance.
Mark

I would think a 35 to 40 hp.model, would do. Ed

A "H" will pull it fine. A Super "C" will if your land is flat.