Torque converter size

As the diameter of a torque converter decreases, the stall speed (RPM) goes up. Most of the factory torque converters are 12-13 inch diameter and have a stall speed around 16-1800 RPM. This promotes excellent fuel economy and drive ability because they are specifically designed for these purposes.
The problems arise when the modifications are done to the fuel system, camshaft or other engine control systems. Smaller diameter torque converters are needed to provide more slip at idle. This allows engines with a lot of camshaft to idle better. As the torque converter and
horsepower range is moved higher through the RPM range, the smaller torque converters with their higher stall speeds provide maximum torque multiplication where needed. Also the same torque converter will react differently when used behind different engines. So in short you need to match your torque converter to the engine / camshaft and gear ratio. If your TC did "take a dump" you'll need to to at least disassemble the transmission and inspect it. I'm sure you will find burnt clutch plates. Make sure you at least flush out the cooler as well. If it was a 3600 as you stated it would be way more than a street car needed. You could run that but you'll have to add a cooler. As a side note, the factory convertor would have been about a 2400 stall.