Most likely they are the same parts. If the 250 will fit, go with it, it should be a little more heavy duty since the engine is bigger.
Just looking at Rockauto.com, the 194 uses a 10" clutch in the Chevy II with 194 engine, the trucks with a 230 CI engine use a 10", 11" or optional 12" clutch. Looks like you have plenty of choices.
Joe
