You want to convert a single engine MiG-3 into a first generation twin engine jet Mig-9? Wouldn't that be a bit like converting a North American P-51 into a F-86 Sabre? The designs are completely different in my eyes. What point of commonality is there between the the Mig-3 and -9? I think it would be easier to just scratchbuild it.
OK, Dan means this Mig-9
The new machine, called I-210 or MiG-9, differed from the standard MiG-3 for:
* enlarged mid and aft fuselage to accomodate the new engine;
* moving back the wing of 100 mm for cg reasons;
* new plywood panels on the fuselage sides;
* aereodinamically balanced rudder ;
* NACA engine cowling with four easily removable panels;
* two side exhaust stacks;
* four fuel tanks for a total of 488 l; the ventral tank was still protruding;
* two oil coolers VMS-8 installed in a tunnel under the nose;
* AV-5-127A propeller, with 3 m diameter;
* armed with 3 UBS 12,7 mm with 200 rounds each, and 2 ShKAS 7,62 mm with 650 rounds each; all weapons were installed in the nose;
* landing gear doors without opening.
see
http://mig3.sovietwarplanes.com/mig3/i-210.htmlOf course the number was also used on the the early jet, I presume as the I-210/Mig 9 was not produced so the number could be re-used.
which is the early jet you refer too.
http://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-9cheers
T