I could make a case for the small block chevy,flat 4 volkswagon even the v-12 jag. But hp is a big part of it. No doubt. Pull a valve cover on my street driven hemi and my 1500 or so hp blown alky hemi and what do you see? The same thing! Factory stock valvetrain. Stock stands,stock shafts(well almost. Heat treated and rechromed I believe.)stock rockers. Out of the box pieces from 40 something years ago. No roller tips or polylocks or stud girdles. Just factory stuff. Was at my engine mans shop. Good looking motor on a stand. Modular ford smallblock. Overhead cammed. He points out the timing chains. And some red anodized aluminum pieces. Chain tensioners and guides. $2500.00 worth. Granted,I run a gear drive on the blown motor. Its been on it since the 70s. What I'am getting at is hemis can be whatever you want so easily. Powerful stocker? Its all there. Blown monster? All there. And the recipe hasnt changed in 40 years.