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I really have no idea why Chris Craft would use a different firing order. The cam could definately dictate the firing order - both valves need to be closed on the compression stroke. If your builder put a standard SBC cam in then I believe it would need to be a standard SBC firing order.
From what I can find 18724365 is a firing order for a counter clockwise rotation engine and 18436572 is for a clockwise (normal) rotation. not sure but guessing the cams have to be different. SBC has paired cylinders 1 and 6, 2 and 3, 4 and 7, 5 and 8. When one is on compression the other is on exhaust.can't see how the reverse CCW firing order could work with a normal cam
This message has been edited by jossar on Nov 19, 2017 9:48 PM