Will a crankshaft from 1977 305 Chevy block work in 1974 350 block?

No, a crankshaft from a 1977 305 Chevy block will not work in a 1974 350 block. The 1977 305 crankshaft is physically smaller and has a shorter stroke than the 350 crankshaft, so it will not be compatible with the 350 block.