You will have that, but it's not detrimental at the "entry level" My transmission guy(can't call him a tranny guy now-a-days) has been running his 2012 ram around on the stock tune 5.7 since we did his truck back in 2011, 130k miles since swap truck only has 140 k on it. HP tuners wasn't that "evolved yet" . we blew up a pre-production SRT392 on our dyno doing endurance tests for FCA, pulled the cam swapped it into the ram and never looked back.
My personal 2014 Ram I ran a 392Auto cam and the MDS system for a little over a month before I said screw it and tuned it.
A tune will take advantage of the swap......Now two things , 1) if your running an 8speed , look at the 6.4SRT shift schedules for trans "tuning" if you find the need to take full advantage ..if it's 6sp , I recommend reading this thread , and for FULL advantage contact JimP , he's really good with the later RFE trans.
https://forum.hptuners.com/showthrea...-for-the-65RFE
2nd , and it's word of caution , 2014 FCA changed suppliers for the 5.7 springs, the (OEM)09-13 springs are a thicker coil wire , it will bind if you find your self in the 6200+ RPM area.., you can visit , but don't stay for dinner..... 99% of those who do this swap will not experience it, there's that much slop in the early lifters , but if you are like me and believe life begins at 6500rpms it will get expensive.