Powerglide cars ran 235 engines with hydraulic valve lifters. Trucks (except for big rigs) ran 216's with solid lifters.

NOS and NORS are usually parts intended for the same application. NORS is sometimes used to indicate a non-GM part manufactured back when the vehicles were daily drivers as a replacement for a factory part- - - -Like Blue Streak or Standard brand ignition products instead of Delco etc.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!