You will need to find top dead center on cylinder number one. This basically means to pull the plug on the front right cylinder. Bump the starter until you can kinda see piston. Remove the distributor rotor cap and see where the rotor is pointing. It should point towards the #1 cylinder. If not, and you have access to big sockets, there is a big bolt head on the lowest pulley of the engine. Stick the socket on it and turn it either way until the rotor is pointing towards the right cylinder.
Now when it's in the right position, when you put the cap back on the distributor, the pole right above where the rotor is, is your #1 cylinder. Put the plug wire from there to the #1 cylinder, then keep going one by one in the firing order. The firing order should be marked somewhere near the distributor. If not then I think it's 1-8-4-3-6-5-7-2.
Hope this helps a bit.