The engine makes a pretty good model conversion. Very little cutting to do. Get the parts from Carr Precsion
It's the third engine down...
http://www.carrprecision.com/Pages/prod02.htm
.
If you want a battery powered ignition use the C-H
http://www.ch-ignitions.com/
They have all the conversion stuff
Ralph Cunningham at Rcignition can convert it for you.
Enjoy,
Jim