Peck's performance is extremely close to how Thulsa Doom is like in the Scripts, probably not a coincidence, his physical description is nearly identical to a younger Peck.
https://www.youtube.com/watch?v=PPGwMyqWouU
Peck holds the rope much the same way Milius had Arnold do with the spear. Conan singleminded quest for revenge also echoes Ahab's of course.