Stalling at idle in gear

Before I change my converter the would idle just fine in park and neutral but the minute you put in gear it would just die. Didn't matter if it was forward or reverse it would just die. I have what I think is a stout 360 in my Dart. 73 360 bored 30 over, stock stroke, stock rods, Keith black hypertectic kb107 pistons, out of the box edlebrock heads, Huges Engines cam 540 lift exhaust side and 524 lift intake side (if I remember right), eddy air gap intake, hollley street avenger 77cfm carb, 727 trans, 3:55 geared 8.75 rear.