Thanks for the suggestions.

As I said before, I NEVER had ANY starting issues with this car before letting it sit 4 or 6 weeks. No grinding, no nothing.. I know something just got frozen from sitting.. The reman Bosch starter operated perfectly from 280,000 miles to current 320,000 with no problems. I can pretty much say for a fact the starter was installed correctly and I don't have any missing teeth on the flywheel. IMO, the solenoid is just not throwing out the gear to contact the flywheel for unknown reasons.

I actually fell asleep after a long day of work, but I will be outside tommorow and I will post back.