The needs to perform acceptable quality engine servicing changes as the cars get older, acquire mileage and need more than was listed in the "when new" service guide. With that said, it is not necessary to pull the motor in a 360, unless it's hammered and needs servicing beyond a lock and swap belt change.
To me, the 4200 Spyder and 360 are no comparison. They make similar power but the Maser is a lot heavier and has a much softer suspension system, amongst other things. You're going to get two very different driving experiences.
With the help of Formula Dynamics, we co do a lot to give the 4200 Spyder some proper attitude, however it's still nothing like a mid engine, flat plane crank Ferrari. Different chassis, different suspension geometry, different centers of mass and different engine power band characteristics.