I looked and the coil wires will only go on one way, so I know I have them right. I tried to rotate the dist. 180 degrees but it won't fit because of the vacuum advance hitting the block.

John, By checking the firing order, you mean the location of the wires..i.e. 153624? It is a 250 I6.
They ran the motor at Jasper where it was rebuilt. Would they have made valve adjustments then?