It'll help, but not enough to be worthwhile. If you intend to just do cruise-ins and drive the car around...go for it. I'm sure it'll drive good on the street.
Just my 2 cents, not trying to talk you out of it if that's what you want to do. I feel like your car would run better w/ a smaller manifold, but not THAT small.
No. Its a good discussion....We talk wedges so much on here, its nice to talk Hemis once in a while. You thinking the Barton or the -3? The only reason I never went with the Barton was really the non-removable center plate and the weight really. We had a 4150 version on a 484 Hemi, and it ran like a scolded monkey....It was basically a street car and went 10.26 carrying the wheels to 2nd gear...I figured the Barton would be too small for 600 cubes.
And I have run a tunnel ram on my previous Hemi, just not one this big......
