Help!!! won't start....Mechanic please!

Alrighty so everything ran before you changed the rear main seal?

Alrighty, you said piston at TDC, rotor pointing to #1, etc, etc...However. Is it on the Exhaust Stroke TDC, or Compression Stroke TDC? To tell you can stick your finger over the plug hole and crank it over by hand, pressure will be a lot higher on compression than exhaust stroke of course. Or if you have a valve cover off, or a valve cover with a nice oil fill where you can see the #1 rockers...watch the intake valve close, then watch for TDC on the crank

Does it crank over? Does it try to pop, sputter, anything? Visible fuel shooting into the engine from the accell pump of the carb?

Easy way to check for spark if you have no fancy tools to do so, is take an extra new/old spark plug, lay the threads on a good ground and hook the other end to a plug wire. If even you cant do that with another plug. Take the coil wire, put it near a ground, as close as you can without touching, crank it over...you should see spark there. (make sure no fuel vapor around!)