So I put my 347 in last weekend and noticed the exhaust port size on the Dart aluminum heads have a more square port shape than the stock cast iron heads. The bolt pattern is correct for my standard headers but I am not sure if I can use my "normal" headers.

 

What are your normal headers? And which heads are it? Some longtubes would be nice with the 1 5/8" primaries, if it has larger heads then 1 3/4 primaries. You don't want the header port smaller than the head port, that'll kill power.