If I want to leave the rocker arms in place, I take the two outer-posts bolts out and replace them with longer bolts and strong washers. Put each bolt through a washer and then through an end of the lifter chains at either end of a load leveler; and, then lift the engine.
I do not know if this is good for the head and/or the head gasket seal. I have done this many times with 235 and 261 engines (with or without transmissions) and have never had a problem.
