Torque converter affecting idle question

My slanty TC is pretty tight, which behind the slanty that idles sweet at 500 in gear, 550/600 in Park is no biggy. And it has the torque to pull away at that rpm.
But I can see that TC being a chore if the N/P idle HAD to be 1200.
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.