any benefit to swapping heads?

If you spread the trans gears then you have more rpm drop so have to create a broader torque curve
and if you do not spread the gears out you need a broad torque unless your drop the rear end ratio
best to not overcam
I vividly remember a blown 55 chevy at an early Bakersfield march meet with a T10 and low gears- really hurt the years- super fast speed shifts and he did not break it
we broke Dodge's version of that trans behind the Super Stock Wedge- went 727