340 Not firing on all cylinders

If someone can confirm Badsport's diagram I would greatly appreciate it!! According to that diagram, I think the PO reversed 6 and 8. IIRC I am pretty sure it was the centre (closest to firewall) on the cap going to the #8 cylinder. Also it might make sense since both 6 and 8 were considerably colder. Man I HOPE it is something that simple!! I don't mind looking like an idiot on the NET if it cures my problems that easily!!