68 Valiant

ill be posting soon. I picked up the motor and transmission thursday. I need to order mounts, headers and misc. items needed to at least set it all in the car. I posted a header question in the exhaust section asking about about TTI's 1 3/4, headers and are they the best choice? I know they are the best fit, but this stroker is making 590 hp, and am questioning the tube size