B&M 2400 HOLESHOT Converter

I'm surprised no one has mentioned it yet, because usually, the answer to these type of question is "stay away from 'one size fits all' off the shelf units"

I had PTC build me a torque converter for my car (and they asked for a TON of specs) for about $500.00 shipped

X2 on this sentence. Go with a converter supplier that asks you everything about your car. Engine specs, tire size, axle ratio, end useage etc. If they don't ask these questions, RUN, don't walk away from them.
I've said it before, and I'll say it again, a properly applied high stall is a wonderful performance addition, improperly applied you've just thrown your money down the toilet. Good converter suppliers (builders) will ask you all the right questions to GET YOU the converter for your application.