Torque converter affecting idle question

AJ/FormS said

But I've never had a cam in a sbm,with under 250*@050,that couldn't be tuned to idle at 750ish,or less.

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Same here. My 408 has a Racer Brown solid FT with 240 at .050 on a 108 LCA and it idles fine at 700 in gear. It'll idle down to 600 in gear but the plugs don't burn as clean so I run it at 700. By the OP's description it sounds like a tuning issue