Yes you need to change the springs,
Personally I do not think the swap to the 6.4 cam is worth it, 6.4 cams are no longer 80.00 Mopar rasied the price to over 200.00 now, If you are going to spend the money for what is needed to do the swap why go cheap on the most important item that has the potential to make the most gains? all of our customers with a custom 5.7 cam and long tubes are pushing over 400 to the wheels
