Chris
I hope this helps in your task, I have the crash date as 11th Aug 1978
In the 1960's seven B Mk.2 aircraft were converted from having Olympus Mk.201 engines to Mk.301s. They were XL384 through to XL390. Although it may appear to be a simple task, it was in fact a lengthy and costly conversion which grounded these aircraft for several months at a time
XL390 crashed into a rubbish tip whilst performing a display rehearsal at NAS Glenview, Chicago Illinois, when it stalled during a wing over manoeuver.
The aircraft was on the strength of No 617 Sqn at the time who were then based at RAF Scampton.
If I dig out anything else I will post it
BT