Compu cams XE268H question

I wrote this number down from someone earlier I talked to on here. I don't know if this is the right cam or not. If I decided to go with this cam and put the 340 x heads on the 360 engine in my sons Dart, would this be pretty noticeable change over the stock engine. With this combo, would I be able to run the springs on the 340 heads, assuming they are stock heads or would the cam come with springs. I am going to have the heads done and have the springs changed at that time.