Running

'Project <40min 10k' is underway in preparation for race at start on June.

8km of 1k intervals at <4min/km with approx 5:20/km rest periods. I honestly don't see how doing this x10 is possible. Hopefully adrenaline will help on the day.

do you mean 1.20 rest after the sub 4 minute K?
if you do thats plenty
you need to able to bang out 8 smooth sub4 min ks,
the first in a race youll be rushing, and the last will be bang out to finish,
suggest using a stopwatch and nailing 8 sub 4 min ks, strict distance, very short break then kick