Gray,

Could possibly be a Yak-9U; however, the Yak-9 in almost all variants has an oil cooler under the nose. I also love the Mig-3 and there is far more information available on that aircraft especially if you are going to scratch build.

Mig-3 links:
http://www.ctrl-c.liu.se/misc/ram/mig-3.html
http://mig3.sovietwarplanes.com/mig3/mig3.html
http://www.airwar.ru/other/draw/mig3-2.html

Marc