Can a transmission from Chevy 305 fit 454?

No, a transmission from a Chevy 305 will not directly fit a Chevy 454 without modifications. While both engines use the same bolt pattern on the bellhousing, the 454 produces significantly more torque. This means the transmission from the 305 likely won't be strong enough to handle the 454's power and could easily break.

You'll need a transmission designed to handle the higher torque output of the 454. This might involve using a heavier-duty transmission from a larger vehicle originally equipped with a big-block engine, or possibly a custom-built or heavily modified transmission. Just bolting the 305 transmission up would be risky and unreliable.