Engine Number - what year

[SimonH450P]

Hi all

I am looking at an E-type that outwardly looks like it has been fitted with a 4.2 Litre XJ6 ser 1 or 2 engine.

The number quoted is 7L 98187-8.

Does this number look legit to any XK engine gurus reading? It looks high to me, given that the detail off of SNG Barratt site shows ser 1 4.2 engines starting at 7L 1001 and the ser 2 4.2 engines starting at 7L 74000

So does the number look legit and if so, can anyone take a stab at what year it may have been built? If I am to take it on, I need to be sure of parts suitability and service specs etc.

with thanks