OK, so I've taken the first steps, lined up some marks, checked the exhauist cam position on No. 1 cylinder and taken some photos. And perused (for the umpteenth time) the write up by Ian (75coupe) on static ignition timing. This one:
http://www.betaboyz.myzen.co.uk/forum/index.php?topic=2099.0The photos (hopefully) show that #1 exhaust cam is on the closing stroke, a tippexed line on the crank pulley lines up with one of the marks on the cam belt cover and the distributor with the cap off. The HT lead for no 4 cylinder plugs into the distributor cap pretty much 180 degrees opposite where the rotor arm is pointing to. I assume this is significant.
All advice gratefully received and happy to take further photos if you tell me what to point the camera at.