you really cant pick a good cam right now because it wont be good if you do forced induction. You need to decide what you are really gonna do. If you are 100% sure about forced induction in the future, then put the LS6 cam and deal with it until you do it, or wait and do it all at once.

Also since you do tow, id keep the truck intake as well, your giving up more than you are gaining because you still need a low end to pull whatever it is your pulling, but again if you go FI, your low end probably wont be hurting

 

the difference in low end torque between the two intake manifolds has never really been proven cuz noone has ever tested it really. that 215/215 cam would work fine with nitrous or boost...probably not as good as a split cam but it's probably not a huge difference between a split cam and single pattern. i would go with what you planned on with the 6.0 heads and the 215 cam...or even a 215/220 with the same .555 lift and a 114 LSA

 

Would the 215/220 be better with nitrous than the 215/215, or would there really be that much difference? Can the LS6 valve springs support the .555 lift? I thought they were only rated up to .540?

 

the LS6 springs will live to .600
the nitrous would probably like the 215/220 profile a little better

 

the nitrous would like the 215/220 "better" but will perform great on either. i've even seen guys run big shots on a 230/227 cam....they just put up better numbers with single or split cams

 

If you go with a supercharger you wont make the boost levels that you should expect if you run a cam with a 112 LSA. It wont let the boost build up like a stock cam or the LS6 cam.

running one of those cams could slow you down because you could lose boost because of that