Decided to replace fuel pump pushrod and gaskets first, was leaking from insulator block base.
Removed fuel pump then eased insulator block up and out, was tight, but easy enough.
Unfortunately insulator lock had sheared off, leaving tapered part firmly lodged in hole.

Tried very gently an easiout but stopped as no movement and wanted no debris falling into/onto cam.
Now I'm stuck, has anyone had same problem, if so will be grateful for any advice.
Realistically I know I am looking at fitting an electric fuel pump, which is best to buy and fitting?
I could take a chance and reuse original block as tapered end is in situ and I could place bottom gasket, then install pushrods and then rest of block, making sure pushrod is not binding. Then refit pump.
Bl...y ell!
Chris