Drove 150+ miles with clogged fuel filter - now won't start

[Dave]

Things to check;

Timing - screw timing bolts all the way in!, don't just do a couple of turns into the soft ally, recheck once belt has been tensioned
Pump orientation - are the studs on the bracket the correct orientation, the pump should slant towards the block, I assume you wouldn;t move these but ill list it anyway
Glow plugs? - simple one but can get people, check with a battery lead straight to the rail relay could have popped
Correct injector line - I assume again you haven't changed these but will list anyway
Take out solenoid valve to rule out, but as you have clag I don't think its this.

I bet whats happened here is the original issue was something small like filter, then not re-bled but changing the pump etc has created another issue altogether, most likely timing of either the pump or cam. They can run really rough with incorrect cam/pump timing, but need a strong battery/glowies to actually start, then people assume the timing is correct because it has started.