After searching the GT40 forums I came across info on the Inglese cams that Comp Cams makes. (same family of companies now). This 2012 catalog lists them and quite a few Weber accessories. All still available but not listed in the 2014-2020 catalogs.
I think Jim Inglese got all the Webers sales back it seems.
http://www.efisupply.com/images/fast...12-Catalog.pdf
I'll probably go with the 35-491-8 hotter of the two offered in the 5.0 firing order. Still sold thru Jegs etc... Still need to pull my cam and get the PN to see if I will have clearance. (My PN is unk to me and no cam card).