Using 2 row a cultivator?

There are several old two row cultivators (with shields for the rows) for sale here in town. They have 10 or 12 tines on them and are for 3 point.

What would be a ballpark price for a 2 row cultivator like that?

How well do they control the weeds between the rows?

If I bought it, how should I set up the tines/sweeps? I measured them, and they are set up for 38" and 40" right now, they're fairly rusty too. How deep should they go in the ground?

Any other tips or advice would be appreciated.

The sunflowers are in the 6-8 leaf stage, and most are 6-8" tall.

Thanks.

To control the weeds in the row, you will need to be fairly aggressive i.e. move enough dirt to bury them. Between the rows you should be able to get them all. Only go as deep as you need to, otherwise you will bring up more weed seeds and disturb the plant roots.

Small rear mount cultivators (Ford ?) are between $100 and $200 depending on how complete they are and who has them