dual plane will make more low end torque than TPI. TPI shines in the 3000-3500 range.I always loved the look of the TPI intake. They are great for low rpm torque but fall short once the revs build.
That new system should work great and probably improve top end power.
Fred has a lot of great info and ideas.
there is no such thing as a 4L65. it's an internet myth that 5 pinion planets are stronger than 4 pinions. They are actually weaker and if they are non-gm 5 pinions they are total garbage. Not saying that GM 5 pinion are bad, but they are nothing special and I wouldn't waste money on them. The OE high energy band is superior to any kevlar band, more marketing "hype".