Ade,
When I stripped and rebuilt my old Xflow, I found a good starting point was to get a tray divided up into 4 rows, each row split into a number of boxes. The 4 rows are for each cylinder, with the boxes in each row for components, e.g. Inlet, Exhaust, etc. Label the box Front and Rear, and as each part is removed, put it in its compartment.
I used a wooden tray, which had been around in the garage for a while, and had built up a nice layer of ingrained oil and grease, and I also placed an oil cloth over the tray when not using it.
Anything which is being stored for any length of time, I'd wrap in an oily rag.
Enjoy. Xflows are great to work on.
Dave H