Rye:
Your best bet is to obtain the plans from Bob Holman if you need the exact CofG location. http://www.bhplans.com/
I built and flew the Mk XIV/XIX of 69" 12.5 lbs dry with a .91 OS 2 stroker and it was awesome!! Scale flight and sound!
Seems to me a 1.40 is too much for this small bird.
See photos at: http://mywebpage.netscape.com/warbirdscale/

JG