In a way Dromo's firing orders are all correct. In every example he offered, #2 fires after #1, #4 after #2 and #3 after #4. As long as #1 fires when #1 piston is at TDC it doesn't matter which distributor cap post is designated #1.
The convention of #1 being furthest from the block is certainly worthy in terms of uniformity and as mentioned, belt clearance.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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