A few engine swap questions

[jonzcustomshop]

I am going to change engines in my 63 and 64.
the 63's engine is pretty tired, but still runs.
the 64 has a good engine.
they are both 230/250 6's.
*the entire front sheet metal will be off both the trucks for the swap*

#1 is it easier to remove and reinstall the one bolt in the center of the side mount, or the 3 around the perimeter?

#2 the exhaust manifold on the 64 is cracked. Can the motor be pulled with the exhaust and intake off the motor, and just pulled to the side?

#3 is the intake connected to the exhaust manifold? It kind of looks that way under the carb..

#4 would the best method at the rear be to unbolt the bellhousing from the motor, and leave the bellhousing and tranny connected and in the frame

thanks for any tips.