Ford marketing? 
The shop manual only refers to the 351 as HO (only available for Police and Canada).
Here's a good link: http://www.302w.com/Firing-Order.aspx
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Mike
'82 SSP (Marketing Order)
'83 Colorado State Patrol #202
'83 Texas DPS
'85 Florida Highway Patrol #1422
'93 Florida Highway Patrol #1187
'93 Florida Highway Patrol #1363
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