Looks like you could replace hydraulics with solids and not the other way around, because the hydraulic lifters can't keep up with the aggressive ramps of the solid cam.
I doubt it'd fill the engine with shavings. Hydraulic lifters compress if put under too much load. Solid rollers are generally very aggressive and require high spring pressures to keep the heavy lifters seated on the cam and it's that high spring pressure that compress's hydraulic lifters causing it to lose lift and duration.
BTW: your biggest problem is those 4:10 gears, not solid lifters. Definitely not hwy friendly gears. Had them in my Cuda and hated them. Could barely run 55-60 without the engine sounding like it was gonna come apart. Put 3.55's in it and drives great now. Engine noise is greatly reduced and I'm sure it'll last a lot longer