Need some help to i.d. an engine . its a Lincoln or truck Y-block but I cant find any references for the numbers on it.
Cast in block beside dizzy and again above starter on side of block is 5750281 .

Cast in side of heads is 5750117

cast on passenger side of block ahead of engine mount boss is 80y:2

cast on heads under the rocker gear is 80f on one head and 80h on the other.

Stamped into a machined face on the drivers side of block below head is 3-81Em

it has rams horn style manifolds with ECS9430A cast on them .

So any clever blokes out there who can help ?