Use the bolts on the front and back of the heads instead of the intake manifold face. Chain could divot the front face where you are trying to seal the intake resulting in a water leak or a vacuum leak. On the head a dimple will not interfere with anything later.
No need to retorque head bolts.
I use a steel plate bolted to the carburetor flange on the intake manifold to remove or install a motor. I would rent or buy a cheap (1,500 pounds) engine hoist to pull and install the motor if you don't already have one. I used to use a five ton hoist because it had an air over hydraulic pump to lift motors and was as stable as the rock of Gibraltar (but it got sold with the shop when I retired from engine building).