Headers for a 70' Dart Swinger

I here you. Ya all the A bodys from 67-76 have the same size engine bay. Sorry I get cornfused some times....er ok mabby all the time. LOL

No problem. So the engine bay, firewall and undercarriage around the tans tunnel is virtually the same being an A body? Also with fenderwells, do all of them have tire clearance issues? Is it easy to avoid with a smaller diameter wheel and small wall thickness tire?