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It's probably an FT motor. They were refered to both by 389 and 391. I think they were made up until 1978. What's it in? If it's a big truck, it's probably the FT. But it doesnt make a difference, the firing order is the same.
The firing order is 15426378. The right side cylinders are 1,2,3, and 4, with 1 being at the front. The left are 5,6,7, and 8, with 5 at the front. The left and right designations are sitting in the driver seat. All this information should be cast into the intake manifold also.
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