550rwhp is not gona happen with 7k for a N/A motor (

not w/o spray). I hve done a decent amount of searching and although not saying its not possible, i havent seen one pull those kind of numbers w/o trick flow, AFR heads, or a WELL thought out LS3head/cam (LS3 being the cheapest) combo. All running shy of 3k alone. You dont necessarily have to have the best of the best parts, but dont skimp either. I actually have a 418LS3 at home awaiting for me to return from the desert. A weak point in my build are my heads. I kept my 243's (budget wouldnt allow for anything more) but had them sent off to TEA for their Stage2 job. I know the numbers will be solid in the end but, it just wont top AFR or Trick Flow.