Heard, I've had both Fenton's and Red's....the Fenton's were on a '39 and I did have to do some grinding and modify the dipstick. Also, the rest of the system had to be custom made by a muffler shop.
I have Red's on my '47 and they bolted right up without any clearance issues....yes, I know not identical steering boxes....but I was able to get all the way back to the tailpipes with the headers, connector pipes, and Smithys, doing it myself. Did have to have the tail pipes done professionally.
All in, my cost was about half with the Red's stuff. And, Tubman is right, the Fenton's may outlive the car!! If you go the Red's route and you don't opt for the powder coating, do yourself a favor and get a can of the Eastwood hi-temp manifold paint. They will rust if you don't and I really hated that look. Taking them off, doing the painting, and putting them back on was not a fun project!!
As noted above, the people at Red's were a pleasure to deal with and very responsive.
Keep us posted and best of luck!!