Got any driveline company's in your city?
We have several and I deal with a couple of them since I own a fleet of trucks. I had one built for BB E body over 10 years ago. It runs smooth to over 100 MPH and was very reasonable in cost.
This is coming from someone who has bought a ton of Mark Williams products over the years. IMO shipping is too high for something common like a drive shaft that can be made local for a door car. Yes even for a "race" car.
Yup I weighed it and it weighed less than my steel driveshaft.
I went from a 8.75 rear to a dana rear and needed it an inch longer I think? Took my old shaft down there to the local driveline shop and said I want it an inch longer and they got it right the first time. I know them also so why not support the local guy?