Do yourself a big favor and remove the block from the engine stand. I have seen those bell housings break off from being hung on that type of engine stand.
How is it I knew someone would mention that ……. In my 54 years iv never seen it
I had to use a 1/2" carbide drill to drill the heads off several valves to get them out.
They were rusted in the closed position and I couldn't get them to move.
Worked good once I figured it out.
Only the exhaust valves if they are stock Ford items. The intakes with the recess in the head will just bend..
If you hit a closed valve in the center of the head with a ball peen hammer the head and the stem will seperate or break off.