Here is what is for sale on the market today. TC-71 GM Torque Converter Lock-up
Part #: TC-71
https://www.ronfrancis.com/product/294
Doesn't have all the work of features and the cost is $220.95.
This system by pjomeland not only is a bargain but of a much better design.
My bet is there isn't any comparison on drive ability
Cheers and great job pjomeland.