Thanks Calbert nothing to be sorry about in my haste I didn't explain everything.

Here are detailed photos, and from what HK1837 says I may have the wrong harmonic balancer(?)

IMAG1691.jpg
Original triple pulley from the late 1974 253 engine. There is a small gap between slot 1 & 2 unlike 2 & 3.

IMAG1692.jpg

IMAG1695.jpg
The water pump pulley doesn't line up with the 2nd slot/groove

IMAG1693.jpg
Supplied harmonic balancer (my suspicion it is the wrong one).


IMAG1697.jpg
Harmonic balancer as fitted, I cannot see it can move 'in' anymore (maybe it does).

IMAG1698.jpg
This is the gap between pulley and balancer and I cannot push it any closer.