Okay you have the MDS auto cam, all you need to do is change valve springs. Easy to do with engine out of car, intake are easy and exhaust are a little tougher with the engine in the car. Be very careful when reinstalling the push rods if the engine is in the car(hard to see the right holes in the heads)oil return hole are right next to the push rod holes and oil return hole are tapered the push rod hole are not, push rods seem to always want to fall into the tapered holes. I ran the 6.4 379BC cam, 6.4 intake,85mm throttle body and 1 7/8 headers and SRT 2 3/4 cat back on my 2012 Challenger R/T and really woke that 5.7 up, pull hard up to 6500 with no dips in the power curve. This past summer I put a custom cam in with the same duration at .050 as the 6.4 but cut on a 112* center line(6.4 is 121) and more lift. A little harder to tune but runs even stronger. The Mopar spring kit is about half the cost of the PSI kit( the Mopar kit was not available when I did my springs in 2014).
