Recently bought 72 satellite sebring with a tired 318. Was hoping to find 440 to make roadrunner clone. Found a 400 complete and running out of a 72 newport with 65K. The guy is asking $200. Want to keep this a low budget project. Should I jump on the 400 or wait for 440? Need to change trans if going from 318 to 400 correct? Anything else?

Thanks!!