Torque converter affecting idle question

Is it possible that my torque converter could bring down the idle in gear too much?

I have a 360 magnum motor with unknown cam, eddy dual plane intake, 670 holley street avenger (new), tti step headers, tci 904 trans.,3:23 gears, but i'm using the stock /6 torque converter.

I've been trying to chase it with carb adjustments but it never seems to change just stays around 500 rpm in gear and in Park and Nuetral it idles up at 1200 RPM.