Just be careful where you lift, because the chessis rails are not that strong, and have been known to distort under localised pressure. The front cross tube and rear crossmember are the recommended jacking points.
I agree with DaveW, definitely only jack at the cross members, the chassis will bend at the slightest provocation, just observe the front when driving over bumpy roads, its constantly flexing doing the Morgan wobble sometimes as well. A modern vehicle is a solid structure and only the suspension does the moving.
I Read an article that the Aston Martin vantage can be jacked on one wheel and lift the whole vehicle up,(front or back) now that a very ridged structure indeed. don try that with a Morgan or........
