Intake air tube size?

hey people, so im putting a 6.4 in my 70 duster... its almost done...
Engine has MMX nsr cam, ported throttle body, tti headers to 3" exhaust, x pipe magnaflows and to the bumper, mopar controler, and will be dyno tuned with HP tuners..
The last thing i gotta build is some sort of air intake system...i was kinda thinkin of goin all out here.
My plans are to build a 12" wide by 10" front to back, and about 14"-16" deep box... i will cut a square in my inner fender on drivers side next to radiator and sink the box in... now it will also attach to the front radiator support to catch all its fresh air right behind the parking light... i will open up radiator support for air inlet.... the top of the box will have a removable top, with maybe clear plastic window... and also the box will be insulated for heat...
I got a huge afe filter for a diesel (4" inlet), so i figure i got the flow their.

Here is my question, should i use a 4" air tube from throttle body to filter? Or should it stay 3.5" then upsize at filter??
I ask this cuz i heard the air temp sensor may be effected cuz it dont have the air speed across it if i run the 4" tube...
I figure, give the engine air with the 4" tube, but i dont wanna mess with that air temp sensor when tuneing

Thank you

491D8155-1032-4242-80B6-3B975BD8A453.jpeg

C1BC0B33-D29E-41A2-8AC9-812F4F36FE99.jpeg

719EC781-2B35-45C8-84AA-D2B155CFD0C0.jpeg