the main reason I'm switching manifolds is that I still have alittle bit of a restart issue when I turn off the engine (gas station for example) and it is hard to restart (alittle embarrassing for a mopar guy )so I was thinking an aluminum manifold would conduct less heat to the carb... when I'm shutting the car off the temp is around 170 to 190 max so the car is not running hot.... I also have a spacer (1/2.. 4 hole phenalic)on it now. (edel 750)