Wow! I caught Pat making a mistake! Haha!
A 194 has the same stroke as a 230, 3 1/4". the bore is 3 7/8, like a 283. The 250 has the same bore as the 230 with a 3.53" stroke.
I don't know of any other pistons that will fit the 194 either, though. 283 slugs will work in a 230, 307's in a 250. Not enough wall to bore it over 3/10" to make a 230. Might as well find a bigger engine, like a 292? Or a 250. Keep the 194 head, more squeeze.