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I understand the "head scratch" ,,, car owes me nothing, i can spend a bit. 2001 is it worth putting 3.5K parts in that will add no value ? Its in really good nick, dont want to scrap it.
I think what I would do , is find an old engine thats "buggered" remove timing gears and fit them to your engine.
Read my recent post where i replaced IP [injector pump]
If you work on the buggered engine first you will learn the tricks before you start on your good engine.
Allow a full w/end of work.
If you decide to go this way send me personal message and i am happy to talk with you and help you through it.