I would run run run from that car. If it had immense sentimental value or if you were highly skilled and looking for a challenge, id STILL question it. That 351w may fit between the shock towers, but theres a TON of other work required to make it a driver.
You would be many many thousands of dollars ahead to skip this one and wait for a solid car.
1968 C Code Coupe - Getting a 289 and AOD - ON HOLD
1968 C Code Fastback - Getting a 351W and Tremec TKO 5 Speed - WORK IN PROGRESS!