You might also try contacting Bill and/or Dave Murray at the Shelby American Collection museum in Boulder, Colorado.
www.shelbyamericancollection.org. Phone number on the web site. They have a huge collection of Cobras and GT40s (including Larry Miller's cars) and have an annual gathering (coming up in a few weeks) that draws lots of the old Shelby team. Grant will certainly be there. It's possible Stroke comes too although I don't remember his name being mentioned. The museum is only open Saturday 10-4 (mountain time).