Those heads are not compatible with some of the earlier exhaust manifolds without some grinding. I don't know if this applies to your build, Just thought I would mention.
quriositys sake any idea what ones? i used a 74 dart/valiant 360 drivers side manifold and a 73 d100 360 passengers side for my 66 dart, they both fit great with no mods necessary. my engine is an 87 gran fury 318 with 360 top end factory, its a highway patrol car engine.
