What header to use

Kevko says I should not have a problem,, let me run down problem,, 73 duster had a 360 headers bolted on no problem,, so I put a 69 340 stroker with a kevko m301 pan drivers side fit but are contact with pan,,,pass side will not even match up to heads,,1 tube is hitting pan keeping header away,,have eddy heads and headers are unknown but steering link runs through drivers side