Just out of curiosity, why are you staying with the stock stall?
We have used the GT-7 cam before. Personally, I dont like it that much, but thats just my opinion. We normally do mid to high 220's, 580's on a 115 +2 . Staying with the stock stall, I would worry about it hurting off idle response.
We also have done that Vinci cam with great results N/A in a truck. The customer is outrunning some fast cars.

 

The lope you are looking for will cost you a pound or 2 of boost. I went from a 112 lsa to a 118.5 lsa and picked up 2psi. The 115 lsa you are looking at might be a good compromise. It still has 53* of overlap, which is a lot. I dont think its going to give you the sound you want becasue that 6L is going to eat that cam up. Ive heard the Trucker in a 5.3 and it sounded damn good, but I think the 6L will tame it down.

I did this same search because I wanted what you want. Ended up giving up after the Vinci "062" cam didnt give me the sound I wanted and cost me 2psi. I went with the GT2-3. Click the sig link to hear it in my 6L.

Good luck with your quest

 

This is the Vinci 062 in my 5.3 at 600rpm idle. I had to turn the idle up to 800 to get it to run right so it may sound decent now but add 200 rpm and then imagine sticking it in a 6L. It was smooth as stock
Specs: 210/218 .551 .551 112lsa 52* overlap
http://s7.photobucket.com/albums/y26...tartup_cam.flv

 

You won't get any lope with the GT7. 121 is the LSA. Idles like a tractor. Damn nice cam though. If I were to get spunky I would custom grind the same specs lift and duration on about 113-114 LSA and +4 advance degree it. It would be a torque monster with a little lope.

 

I agree. I like my GT7, and the tractor idle. The tighter LSA (113-114) and +4 advance would peak the TQ sooner, and if your KB has enough capacity to overcome the bleedoff at higher RPM it would still scream. I don't think you would need much more than 210* intake duration with anything you go with.

 

I can overcome some bleed of if neccesary, I can still drop down quite a few pulley sizes. I can run as small as 2.5 on mine.

 

I have been researching the same thing for my 370/KB 2.8 combo I am building and the specs I have come up with and like are:

220/226 .575/.575 116+0 on Cam Motion lobes. Hopefully I will hear someting back from them today to verify that will work well for my setup.

 

I have the trucker cam and i dont have any bleed off. I went with it for the same thing that your looking for in a cam. Pm me if you got any questions. You will be very happy with this cam as i am.

 

216/222 .559/.563 115LSA for me. ALOT of research into that one for low end through mid range without dropping boost. I wanted a cam that was O.K. for N/A but would sing when under 8psi of roots driven air. I found it.

You could get away with a stock stall with this one but a little higher than stock would be ideal.

 

I spoke with Richard at WCCH earlier today, he was very helpfull and expained to me what he thought would be good. The duration was a decent amount lower then I was expecting. He suggested something along the lines of a 208/214 @50 56x/56x on a 114lsa. He said with the stock stall I am kinda limited on the duration, but he also said it would make great off idle power as well. I was hoping for a little more duration but I guess with the stock stall I am kinda limited... hmmmmm Now I have to rethink if I should do a 2400-2600 stall... I really want to stick with the stock stall... Damnit to many variables..