BaggerDad
What do you want to know, here is the quick over view.

Heads need to be modified for push rod angle and oil feed and return.
Cylinders are Sportster bottom flange with Pan top pattern.
Intake and exhaust are custom fab. to work with the cyl. length.
Lifter guides modifed to correct push rod angle.
There are more small things but that is the start.
Ben there done that late 70s.
Skeeter