Thanks for the advice. I had read elsewhere once about this but never really looked into it.
Just had a look at Dakota headers and they seem affordable enough to find on Ebay to try out a set.
My Dart has a console-shifter but the headers could get some modifying if needed. It also has powerbrakes and powersteering (But it's a Borgeson box).

On the other hand I've never seen any good pics of smallblock A-bodies with these kinda Dakota headers on them before.