What rpm stall converter should use?

GTX JOHN said

If it turns out you are not comfortable with them or their pricing =
I have approximate 20 various 727/904 Aftermarket Converters that have only
a few testing run or very little use for about 1/2 price or sometimes less.

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Hay John, Do you know the stall speed of your converters, and if they are loose or tight? And about what price range are we talking about? I need a 727 street strip converter, that’s tight and will flash to 3500-3800, based on what I learned on this thread. Do you have something like that?