what heads to run on a 273

a little more info im a bit new to this mopar stuff..were can i buy some or what im a looking for when i ask?..mopar is very addictive!! im glad im still able to drive my 69 gt while this block sits on the stand want to finish sooner than later..any out there with some aggresive 273 combos..help and input are welcomed !!302 im interested