I have a set of 300 cfm LS1 heads that still retain stock valves. I also have a 224/224 cam. I also have a set of Kooks headers. I will be still using the truck manifold. How much power can be expected.

 

360ish at the tires......but that's just a ballpark number, a good tune will be necessary

 

I say 400 + rwhp, depending on compression. I have stage I heads with stock valves with a smaller cam and made 373 rwhp on a crappy tune. Of course those are Dynojet numbers, a Mustang or Superflow will be in the 360 range.

 

How much power will be lost through all wheel drive?

 

25%....maybe a little more depending on the transmission, a 4L60 is about an 18% loss, a 4L80 is close to 21% and a t-case is probably (conservatively) 8-10%