As it turns out, almost all V-8's have the same 1-8-4-3-6-5-7-2 firing order, even most Fords if you use the GM style cylinder numbering system. I think the 5.0 (late 302) has a different order.

Some of the cam grinders are coming out with a revised firing order to get rid of the 5-7 pairing. This apparently does a few things but the most beneficial is the elimination of a damaging crossfire between the two plug wires - #5 fires, leaks to #7 45 degrees too early and detonation can result.