A few reasons. But if I have to explain, you wouldn't understand. I will say this: Ford fans love and build very successfully 289's, and 302's. Both less cubes than our 318. Chevy fans love and build 327's, and are flattered by their own 302's in the late 60's. For many reasons (which I wont take the time to explain), most Mopar folks not only sneer at 318, but despise the success stories with almost hatred... Just ask Spareparts.