Vic --
The more torque you make the higher the stall speed of any converter... the RPM "reference" is just that... it's a value used to rate one stall speed against another. What the higher stall converter will do is to allow the engine to 'rev' freer / higher - before the converter starts to make the power transfer... doing this also creates higher heat in the fluid (transmission)... and it causes "slip" at cruising speeds... That's why modern overdrives use a "LOCK UP" converter. They have a clutch like system which 'locks up' and makes the automatic transmission more like a stick - direct drive so to speak. But you're running a TH350 so that doesn't count.
Higher stall speeds - lets say a 2500 stall rated converter would allow a motor to idle easier (it's not fighting the torque converter) so is handy if you're motor is struggling to idle... it would "feel" a little sportier as you'd have to give it a bit more throttle to get things moving...
Your motor is not that 'radical' - so I wouldn't go beyond a 2400 stall - and I'd probably be more inclined to go with a 2200 stall.
Perhaps others will chime in here and have additional information for you.
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