I pulled my ST-300 yesterday, and discovered that the torque converter is much smaller in comparison to the converter on the TH350 (from a 78 Trans Am).

It measures 12.5 inches vs 13, and is visibly smaller and lighter. I am thinking I will use it instead of the 13 inch.

Any thoughts on this?

Thanks!

No telling. How was it working for you before you pulled it?

Usually a smaller convertor has a higher stall rpm...usually.

depends on what you want to spend really, i don't believe you would go wrong with a hughes. I would base it on your rear gears and cam set-up as far as stall. I hear alot of good about continental, but you are gonna pay !