To emphasize what L.B. and Sounguy are saying...
A fellow vegetable farmer up the road from me runs a tiller off his 8N and he's very happy with the results. His ground is very sandy loam, and it's been cropped every year, which will make a significant difference.
I think it can be done. You just have to accept the limitations of the transmission and non-live PTO and work within those limitations.