I researched the use of 360 heads on a 318 and got mixed opinion's but seems to me that the compression ratio will drop considerably, I was looking at going with a stock rebuilt set of 360 heads but I couldnt deck the block or heads enough to bring up the compression ration with out tossing off the mounting surfaces for the intake. please excuse me if I do not know what heads are what, I just base my knowledge off of research I am a Chevy guy, but that doesnt mean I dont like Mopar, hell I even like Ford I just know most about Chevy.