As long as the cam is ground for soild lifters you are ok IMHO. I just recently went from hydraulic to solids had the cam reground by delta cams, Tacoma, Wa. I never had luck with the hydraulic lifters they were noisey, far more noisey than my solid valve train now. It is like a sewing machine, quiet but mechanical sounding, really music if you ask me.
1953 Chevrolet 3100261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY GalleryVideo of the 261 running1964 GMC 1000305 Big Block V6, sm420, the next cab off restoration
