You will need tuning to make it work. The 90mm TB will not work but your 6.4 TB should bolt up. I have a 6.1 intake on my 2013 Challenger 6.4 based 426 stroker with an Arrington 85mm TB. If I remember correctly that setup added about 30rwhp over the 6.4 intake and ported OEM TB but my engine is heavily modded with a big cam.
AJ Berge (Hemituner) can do an email tune to make it work. He can also tell you whether it is worth doing on a basically stock 392. 516-603-9276
I had the stock 392 intake ported by Peak Speed and added a 88mm Arington TB. It added 18whp and 29ftlbs. Easy swap and an option for you.
I do not know what it would take, tuning/ECM, to run 6.1 manifold AND older (pre-2013) TB on a stock 392 engine.
The Arrington and BBK 90mm will only work on 2005-2012 and very early built 2013s 5.7, 6.1 and 6.4....different wiring harness and PCM configuration...You really do not need to upgrade the TB unless you do some heavy modding. The OEM TB will flows enough to handle 400+ cubic inches...
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