BB into a 66 barracuda

This may go on twice but the 383 fell through. car sold just hours before I was to go pick it up so I'm back on the 360 build. Broke my heart. My girlfriends brother has a 71 440 he said he'd sell me for a grand but then said he'd let me have it for less. Do I buy it and sit on it for the next build and yes there will be another one or do I dare put a 440 into such a small car?

Chris