The 194, 230, 250, and to some extent the big 292 share a lot of parts, but it's a completely different design to the 216, 235, and 261 engines. Those engines started being used in the early to mid 1960s. The Chevy II and Mercruiser 4 cylinder engines shared a lot of the design features of the later model sixes.
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!