Even if you take the "traditional" Ferd firing order, IE the old 353-36-390, etc, and 289-302, that firing order, when renumbered to reflect GM/ Chrysler cylinder numbering, still has the same firing order. (No1 on Mopar is no5 on Ford, etc
In fact, if you made a timing mark on a Ford using the Mopar no 1 cylinder, you could "think" Mopar when wiring it up!!
