Agree! When I built my 318 20 years ago, I was going to run a set of J heads. An old timer mechanic who worked next to me walked up and just casually said " don't do that you'll blowvyour CR right out of the water... I listened ran the 318 heads and the car ran fine but, it was a 150 horse LA 318 with a mild cam, 600 Holley and headers, I think the only thing it did better than a stock engine was drink gas. But keep in mind it was a true budget build , a set of gaskets clean and hone things put it together heads or block wasn't milled etc.