Torque converter size

Have a 1970 Duster 340 727 am looking to replace my TC is there a benefit to the size of TC such as an advantage to the 9.5, 10, or 11 inch if so what would it be. This is a street car but it was going pretty well but the TC took a dump and it was not stock so I am not sure what would be the best replacement. It was about a 3600 or somewhere near there.