If you did get the flywheel on out of position, it will not cause any problems. You can still rough set the timing by rotating the engine until anyone of the pistons comes up on TDC of the compression stroke (which can be seen looking throught the spark plug hole). You then rotate you distributor to just be openning the points for that cylinder. Install the wires onto the distributor cap based on the firing order and direction of rotation of the rotor and it should be close enought to at least run.
Good Luck! We have all been in your shoes.