First off in case it isn't already known, the Super A, 100, 130 and 140 are progressively newer models of the same basic design. So these comments apply equally to all of them.
The tread can be set from 40 to 68 inches in 4 inch increments. It was designed mainly for single row cultivation. If you stick with a single row, a 30-inch spacing is very tight. Take a 40 inch track and add the width of a tire and you have to fit a 50-inch tractor (with 9.5 tires) between 2 rows that are 60 inches apart. If you open the rows up to 36, you are in better shape even if you set the track at 44. (I've cultivated a lot of 36-inch corn rows with a Super A set at 44 with 10-24 tires.)
Your other option is to set the tractor at 60 inches and run 2 rows at a time. As has been stated, a tool bar type cultivator can be set up for 2 rows. One problem, given that you can even find that cultivator, is the tool bar limits you to about 12 or 13 inches of crop clearance. You would probably like to cultivate taller corn that. The single row row crop cultivator limits you to the front axle clearance, 21+ inches.
Those are the main options and tradeoffs. You need to decide if they leave you ahead of where you are with your current equipment. I'd probably open the rows up a little and use a Farmall one row at a time.
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