727 torque converter questions....

Lock-up 727's appeared sometime around 1977. Non-Lockup 727's continued production as well. See 67Dart273's description on how to ID a Lockup 727.

Non-Lockup to Non-Lockup will swap, Small Block or Big Block.

If you use a "318" Converter behind a 440 (for example), The RPM it stalls at will be higher than it was when it was behind the 318.