What Rumble said. Hydraulic anything can't be moved as fast as solid anything because the lifter collapses. Add the weight of the roller lifter assembly and the geometry with a shorter pushrod and its lose lose lose as far as I'm concerned. Now once you start looking at higher power levels then the picture changes, but again I'll bush the bores and run a solid roller cam long before I choose a hydraulic roller. BTW it's not like 50% more. It's small differences. But cheaper overall and more power IS the result right up until you need a solid roller.
In the OPs case, 400hp is really a stock rebuild with a cam - and a hydraulic cam would do it fine. You just need to make sure the lifters rotate, use a good break in paste on the lobes and faces, the engine starts immediately for the first time, and can be run for the entire break in period without having to shut it down.
