Couple of notes on my high risers. When I ran the drag strip I removed the air clearners and ran bigger jets, the stock filters barely fit inside the hood scoop as it is and are restrictive.
When I was building my engine I had a heck of a time finding HR intake gaskets. Of course AFTER I got a set and didn't need them, I easily found several more (gotta be Murphys Law). While I have a couple of HR sets 'left over', there not for sale!!!
Original HR heads\intake are easy to find? Sure, except when you actually NEED them, then there nowhere to be found (gotta be Murphys Law once again)!