The 401 or 360 is a good motor. Just make sure you have a good fuel pump and you'll be golden. I ran a cam'd 360 in my Waggy, with a big exhaust. It was surprising fast.
Man, I really miss that old beast.
Mine was a 1978, 401, TH400, Quadratrack.
Sold the 401 for $1000. Bought and Rebuilt...