Greg, a #6 or even better a #7 would do a fine job. There are YT videos on 'restoring' old planes, flatten it as best you can, polish up that blade and most importantly build a proper shooting board. The time spent on building a shooting board is well worth it! I have tried all the methods discussed here and the 'worst' by far was trying to use a power jointer. I used to believe (when I was a beginner and more than a little naive) a machine had to be able to do it better. But the more I use hand tools, the more I discover that "those olden day guys" really knew what they were doing
Now I have a really nice plane (Lie-Nielsen Mitre Plane) which my wife gave to me for Christmas this year, and I spent a day in the shop building a decent shooting board, with a UHMV strip applied along flat for the plane to ride in. Glides very nicely. The ramp is angled so that the blade cuts on a bit of an angle and you're not always using the same spot on the blade. The best thing about this approach is you can build the board to suit any plane you get (I used to use a #7 until I got this one) and for any length you need.