I believe you can go with mech lifters but you need to change out the whole rocker assembly.

You can get a custom ground cam from TEP for I believe $169. Just have it ground for hyd lifters. I put a Clearwater on mine with the mech lifters and can honestly say, I prefer the hyd ones...

02 Ford F-250 4X4 PSD...zero body damage
67 Weimann 18' Jet boat...zero body damage except for the trailer drags on the ground from time to time