[wilf leek]

DV - thanks for jumping in - its 2.30am here, my brain is not functioning as it should. Could be your crossed spark wire suggestion is the simple thing I forgot about!

Buzz- if you know your firing order, (351W is 13726548) then it's just a case of going around the distributor cap in the direction of rotation (anti clockwise as you look down into it)and following the leads, having made sure you got cylinder no 1 right. (Turn engine until you are at tdc on the firing stroke for no 1, see where rotor arm points at). Cylinders are numbered as follows - looking from front of engine, lh bank goes 1234 front to rear, rh bank 5678 ditto.
I made the assumption your engine is a 351wstroker, hope I got that right.

hth