Solid Roller Lifters on Hydraulic Roller Cam

You can use sol lifters [ roller or FT ] on a hyd cam provided you keep the hot lash tight, 0.006-8".

This is easy with an all iron engine as hot lash is very close to cold lash. With alum heads, you have to set the cold lash tighter to allow for the expansion of the alum when hot.
Easy to find out the hot/cold lash difference for your engine.
Set lash to 0.005" cold. Have tools + feeler gauges ready to quickly remove a valve cover.

Get engine to operating temp, switch off, & remove v/cover. Find a loose rocker & measure the lash; next morning measure the lash on that same rocker. The difference is the hot/cold setting & you can adjust cold lash accordingly.