Power Gains w/ new intake manifold???

[Blaster]

I posted awhile ago about h-pipe power gains w/ my combo of Edlelbrock 6037 heads, pulleys, 15/8 shortys,k&n,e-cam, and 3.55's, and hollowed stock h-pipe. Anyhow I want to go with a new intake manifold set up instead of a real off-road h-pipe(no emissions worries here!hehe) Anyhow will it make much of a difference without a new t-body and mass air? Can I get a couple 10ths with just the new manifolds? Will it be noticeable?