Howdy,
The D-Port shouldn't matter unless it has been enlarged a lot from porting (and lets hope that is not the case). Your pipe should not match your opening anyway so a round tube will be fine on a D-Port head. The only possible issue would be coverage of the port but I would guess the Fast burn heads to have smallish ports. Not a bad thing by the way...
The fast burn head has the std bolt pattern on the exhaust flange so any 23* SBC header will bolt up. Again the D port shape on this head should not effect the header selection. Without knowing any other specifics on the engine I would make an educated guess and say 1 3/4" tubes should do you well.
Chris
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