Emissions controlled engine. But with its relatively long D port runners and moderately sized funneled plenums the Weiand hi ram isn’t the torque killer that most other tunnel rams are known to be. Agreed that it still isn’t the best choice for a low compression stock cam engine. The light vehicle weight, 3.73 gears, and three speed automatic transmission is going to reduce the negative effects. It’s the carbs that are killing it. What does the time slip say the eighth mile time is vs the quarter mile time? Having the engine stumbling and bogging to the eighth is masking the mechanicals. Usually, the optimum carbs on a 440 with standard intake port window heads is a pair of competition type 750 cfm double pumpers pre tuned to a dual carb application.