Engine #LF9001

[vstibbard]

I’ve been tidying and cataloging my parts and came across this engine. Head and block share LF9001 stamping.
Can anyone help me confirm if this was a Mk2 Lotus Cortina engine or identify what model it came out of pls. Is a square cap L block with 6 bolt crank, 125E rods and head is late version with stiffening gusset between 2 and 3 cylinders, no letter stamped in plug valley behind timing chain case, and later pre Sprint cam cover with no boss for stromberg throttle cable guide.
Cheers
Vaughan