The decision on type of retainer will be made by the person doing my headwork.
Titanium is $$$$$$$$$$$, aluminum has a bad rep due to chafing with long mileage. I use aluminum only on low pressure, high maintenance motors, and they're hard to find. Most people use quality steel replacements, no weight saving.
The stall speed on the converter is 3000 rpms for sure because it's now in the car and I can foot-brake it to 3000 before the tires break loose.
Not entirely reliable. If the motor is stock now, the stall will be less with the new cam, even with 11:1.
Stall is not where the tires lose traction, but when the brakes can't hold the car back or the engine speed doesn't go up. You may have more than 3,000 now.