I have a chance to purchase a set of these heads for my truck. Do you think they would be overkill or just right for my combination? (in sig)

 

Not overkill, but they would really like to have a little more cubic inch to back them up. They will fit and work fine on the 6.0 in your sig, if its for anything smaller, I might recommend another route.

 

Would something like a set of Stage 2.5 5.3's with 59cc chamber be good?

 

buy the 317's..you'll love them.

 

Either 2.5 or 3.0 would work well, although I am just assuming that you are working with the setup in your sig...

 

Yes I am working with the 6.0 in my signature.

 

If you can get the 3.0s for a decent price, then thats the route I would go. Just make sure you are getting them from a reputable source. Better yet, give me a call and I might be able to find them in our system, then I can get you some specs on them.