As you probably already know, the early (up to 67) torque converter have a small snout and can be difficult to find.
Do you know of any torque converter rebuild companies in your area? They could recommend a stall speed based on your combination and rebuild yours.
Maybe @4spdragtop or @oldkimmer know a FABO member over your way who could recommend a company.
There are a number of them in the states. Here are two.
