Please Help: Removing intermediate shaft.

I have a 1968 Barracuda that I put a new rebuilt 360 about 15 years ago, now has maybe 5,000 miles. I never finished the project due to money issues so the car hasn't ran in 11 years. Now I have some time and money and was going to fire it up. I put some Marvels in the cylinders and was going to pull the intermediate shaft and prime it after changing the oil.

This is where the problem starts, the motor looks brand new where I can see around the intermediate shaft. I cant get it to come out. I marked it before I started and I got it to turn maybe 1/8 of a turn and have ruined 2 screw drivers in the process. I would like to avoid removing the intake to replace this part and prime the engine. Next I may machine down a 1/2 drive extension to go after it with. Please help.