Be advised that new chutes and discs can run the bill up really quick.

Also, if you can,convert it todouble disc openers if it doesn't have them already. You can plant in wetter conditions than with a single disc opener. I also think depth is a little easier to control depth with the double discs.

I'm also a big fan of press wheels. Don't know how much it would take to convert an old chain drag drill to press wheels, but I seem to get a lot more uniform germination with press wheels.

Good luck!