Didn't see it mentioned, if ordering new or reusing the head nuts and washers make sure they are hardened as there are some poor quality ones out there for sale. Have had a head nut, from one of the main suppliers, strip, when replacing the head on my 2L Mk1 Vitesse used mini flanged head nuts as mentioned on this forum.
Early 2L Mk1 blocks used a different crankshaft from later ones and a different fuel pump, just the arm is different, it's position is higher up on the block.
A pack of twenty mini nuts will do the head and rocker pedestals.
Best of luck with the rebuild.
Paul.