I have a Chilton for an 87 250 and the firing order for it is as follows. It may be of a help.

Dist rotation-Counterclockwise

From the front of the engine to the back:
left side: 1,2,3,4
right side: 5,6,7,8
dist placement is from the 12:30 or 1:00 postion
1-5-4-2-6-3-7-8
Hope this helps.