I love the 13.4 setup. But after the cost of the s14 valve cover and fabrication it was too much for me. I now have over 40 hours in mine after shaving, sanding, polishing, and welding

I will never polish anything again as long as I live.
I have thought about doing the 13.4 on my own. Maybe create a jig so that it could be done correctly. I would be willing to do that if I had some interest from people willing to purchase the service.