We have a 355 with dart aluminum heads, flat tops, hurricane high rise intake, 2500 stall and the 750 AED/holley carb. the question is....it's sluggish at take off(small sputters and a little hesitation) but once it gets going it will freakin scream! but why could it be bogging down at take off? we also think the power valve could be blown to because we had some back firing going on when we first got it running....could the power valve cause it to be this sluggish? should i get rid of it and get something else?? maybe a different intake? any help would be appreciated! oh and this is my first post here...seems like a sweet forum...