Legality of crank swaps

[JS154]

Then what about the S-54 3.2l motor that's currently classed in STO?
Will it be legal for STU at that point? You let the S-52 with it's crappy stock intake manifold in and by opening it up to all 3.2l motors you'll get the S-54 with it's individual throttle body intake manifold and ability to rev to 9k rpm.

Software tuining only on the S54 is shown below. 100 octane race gas is well-settled to allow 8more hp on the S54 engine as well. And that's just a tune and gas. No headers, compression or cam bumps, nothing.

The S54 engine has no business being in STU.