When you say it’s dead, as in won’t crank on the starter motor either? Or it cranks and just won’t start and run by itself?
Have you still got the ram tubes inside the cold air box?
How long did you idle it for before this happened?
Very sad news, I met Alex through Z's as he was restoring his 2+2 and used to bump into him at Historic meetings when he was driving his Formula Vee. I last saw him at Phillip Island in 2018 and he was quite chuffed as he had met up with the chap who originally raced his car.
A very nice young man, condolences to his family.
Geoff