Another option for a 107" is a 4.375" crank,(S&S) and a set of 3.935" Wiesco pistons, and bore your existing cylinders to them. Been doing that for over 2 1/2 years now.
Now combine THAT with a Wood 9B at 11-11.2, and now your talkin'. Make sure it is pointed straight!!!!!!!
Scott

 

how about the se kit 29877-06 it will do what
you are wanting to do for the small sum of $3000.00
"not including labor" LOL

 

What ever you do, WELD the crank, as long at is runs true, as we have seen them all shift.
Harley, JIMS(way too loose fitment on big end, worst) and S&S. S&S's are the toughest of them all, but 4 weld stitches keeps all in place.
Scott