NutmegCT:

If the timing chain was very slack when the engine was turned backwards, then there is the possibility that the chain skipped over the intermediate wheel (sprocket) by one tooth, which would lead to the situation of the distributor drive being advanced relative to the crank position. The Service Manuals do not, to the best of my knowledge, specify an initial timing procedure for the intermediate wheel during assembly, hence it may be installed at will, and the distributor will then also be installed to phase the rotor as needed.