THOUGHTS ON THEE BEST HYDRAULIC LIFTERS FOR A STOUT .508 CAMMED 371???

You certainly can run solid lifters on a hydraulic shaft.
It's been done many times by many, including me.
Really, how long did the cam last?
Not trying to be funny, years back I tried solid flat tappets on a hyd grind and within 100 miles it flatten the cam and dished the lifters. Same springs, Kendall oil 10w-30 oil pressure was normal.