Just started work on a 5.3 HE engine that has been standing for 10 years, believe it was from a XJS.
the engine has no distributer cap or ht leads so trying to fit new ones.

have found two diagrams online showing the firing order, however they are different to each other. wondered if anyone might know which one is correct. - they have the same order but one showns 3B directly towards the front of the engine, the other shows 1a

any help would be greatly appreciated, have tried searching on the forum but no luck