383 running like s#%t.

Yesterday I drove my 67 D200 truck to my shop in the morning and it was running great. I fired it up to go home and noticed it was running rough. It sounds like it is not firing on all cylinders. It is a fresh rebuild to stock specs. The motor has about 100 miles on it now. It is a 67 383, points ignition, edelbrock 4bbl, everything is basically stock. I checked the points gap, checked all of the plugs and wires and all of them are firing. I even pulled the valve covers and checked to make sure the valves were opening, thought maybe the cam went flat. Everything seems to be OK. Anyone have any ideas? It isn't back firing, just not firing on all 8. I am going to do a compression test tomorrow just to double check.