Howdy doc427,
Welcome to Club Cobra and Excalibur ownership
. I think it might be possible to fit a seat that is thinner in the back support area to gain an inch or so. I don't know about moving the pedals, but since the Excalibur and Classic Roadster C427 cars are almost identical you might get some help there. I am ordering the Classic Roadster assembly manual as it is very detailed and will serve as a shop manual for my Excalibur. It might be useful for you to get one as well. If you go to the Classic Roadster forum on this site, you could also post you question there. CR also has it's own forums on there site which I read often. Don Scott is the owner of CR and is very helpful, even to us Excalibur owners. Most of the parts interchange and I've bought some from them. If you haven't made contact with Aloys through Club Cobra, you should. He has an Excalibur as well and is in contact with several other owners in Europe as well. He lives pretty close to Koln, Germany. You guys should be able to get together and have some great fun driving together. Please post the last three numbers of the vehicle serial number of your car and its history, description and photos. Many of us are interested in the history and location of these cars. Photos of mine and Aloys (and Blackbeard's from the Washinton D. C. area) are posted in my photo gallery (just click on the camera icon below my tag ID above.