I like the way my CJ repair manual says and I would do it that way myself, seems pretty easy. But, the opposite valves on the distributor cap can be used I guess. So when the valves on #4 are closing and opening, #1 should be fully closed. Same for 2 and 3.
If this was perfectly accurate, I would think the book would mention it, but hey, it is just the Haynes manual.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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