340 in a 65 Barracuda

What are you doing with exhaust manifolds.The pre 67 engine bay is a couple or 3 inches less in width which is why 273's from 64-66 have that strange drivers side ex manifold .It wraps around the steering to connect to the y pipe. there isn't a lot of room in there .You can bolt it to a 340 but the ports are smaller so it will react to that.