Just a note...chances are your main and rod bearings are trashed as well. I suggest you get a re-man power head and go from there. Resizing the crank will require a significant amount of time, money and scheduling in a local machine shop if they will do it.
What oil do you use???
*Only recommended machine shops in 100 miles:
http://huntsvilleengines.com/
"Eddies" if he is still in business in Springfield, Tn. if he will accept the work (race engine shop)