You can’t rotate the tailshaft housing even with the bolts out unless the valve body is out first.
The park rod is still sticking through the assembly in the tail shaft housing.
Usually the heads hit the firewall and that is basically your drop amount limit.
If you have a small block you need to take the distributor cap off or it will get broken.
I use two large flat screwdrivers to open the snap ring for the rear bearing in the housing.
