Not all 54-57 engines were drilled for hydraulic lifters. I think it was a powerglide-only option until '58 when Chevy did another engineering revision to the 235. You have to change the cam and lifters to a mechanical setup. You can't run solid lifters on a hydraulic cam.

Everything else should be the same. Does your motor have the removable oil line in the pushrod galley or not?

Good luck

Chip


Preaching the Hot Rod Gospel according to the 4-stroke apostles:

Suck, Squish, Fire and Fumes