Just read through those three articles on cGTi. Even more confused that when I started, one thread its not possible to transfer the toothed wheel on the ABF to a 1Y or 1Z crank, and then Dex's thread he's got the diesel crank (doesn't mention which) and an ABF - but its so vague!
I'm in two minds, the gains from the RR from the 2042cc conversion seem negligible over the standard ABF or ABF/KR head combo.