Hughes cams - feedback on their springs/lifters?

I'm giving some thought to a fairly small Hughes HFT cam for my 318. Their website pretty clearly indicates their valve springs and lifters are the way to go with their cams. I have a good running 318 with good factory lifters, and this cam would be mated up with SM loaded heads with SM standard springs.

Question is for those running a Hughes cam, are their springs and lifters truly necessary, or will my lifters and springs do OK? I am not trying to squeeze every last bit of grunt from this build. A nice cruiser with a bit of spunk is the goal.