I don't think there is a design flaw in the intake ports requiring them to be supercharged. Aside from a few common speed parts like 4 bbl intakes and valve covers, most things such as roller rockers, roller cams and lifters will be have to be custom made and expensive. Even though you gain the use of a common piston by using that long of a rod, you will loose significant low end torque by increasing the rod length that long. And likely loose more than you gain by the piston.
What is your objective with this build? Are you racing or street driving?
