I was poking fun at the original posters expertise with SB chevies and lack of knowledge with mopars. He has come to the right place to gain knowledge though! Seriously though our small port big block heads do make great STREET power in stock form. Case in point: The 440 magnum at 375 rated hp was built similarly to the 454 LS-5 (Not LS-6!) 10.5 to 1 compression, hyd cam, non Holley carb ect ect. The 440 magnum ran much much stronger than the LS-5 454 (not LS-6) despite the LS-5s larger intake and exh ports and valves. Im talking stock oem motors here. The LS-5s heads will shine with more compression cam and carb but I am talking street mild stuff- the 440 was a fun no fuss no muss monster.