Header brain fart

In 74 the 360 replaced the 340. It was available in dart sports, dusters, and various B & E bodies. Nothing really changed in the last few years of the A bodies that would prevent the headers from fitting. The floor pan changed in 75 for cataytic converter clearance but engine compartment should be dimensionally the same as say a 71. There were some steering linkage changes back somewhere around 67 or so. I cant think of anything else.