340 6 pack cam???

I gave up on fast rate .904 hyd cams years ago. After testing some wicked fast lobes that crapped out by 6200rpm with strong springs etc,I went backward to some good.842 hyd lobes and softer springs and found 1000 Rpm. A good buddy has designed cams for many companys and told me some years ago that designing a good looking hyd cam was easy,getting a hyd lifter to give that info to the pushrod was the problem. I agree 100% what you see on paper is not so easy to translate through hyd lifters. If I need lot's of area I go solid.