SBC engine mounts for a 62 Impala?

I am doing an engine swap in my 62 Impala. I am going from a strait 6 to a 350 SBC. I understand I need to replace the mounts on the engine but do I have to replace the mount's on the frame. What are those called? Towers, saddles or what? I don't know what to look for. Anytime I look for engine mount it always comes up with the part you bolt onto the engine block and nothing is said about the part bolted to the frame. Will I have to replace these as well?