The best practice is to use a strong engine hoist with wide, evenly distributed chain or straps. Ideally, the hoist should be positioned under the engine block's main structure, avoiding any areas that look thin or weak. The transmission should be disconnected, or appropriately supported if still attached.
Because the Slant-6 is relatively light compared to larger engines, you might get away with being slightly less precise, but the best approach is to distribute the weight as evenly as possible to reduce the chance of damage or stressing the engine block. Always use appropriate safety precautions, including jack stands and support beams where needed, and consult a repair manual for your specific engine model for optimal lift positions and safety recommendations.