Originally Posted by tinman
If those BBK headers aren't a long tube type I wouldn't bother with them.....
Not to throw a wrench in the mix here, but I'm running BBK equal length shortys on my car and they seem to allow decent power. Yeah I think LT's will always make a couple more ponys, but if you already bought them, and with your intended mods, might give them a try. I don't know your budget, but I'm always stuck taking the cheap route.
As tin and blue stated, a kit will always make more power than piecing mods together willie nillie. When everything works together and mods complement each other, you'll be much happier with the money you spent.
EDIT: After reading your post again, putting those heads, intake, headers on might gain you 20-25 hp. What gears are you running? That's where I'd start first. Best bang for the buck.