If you are using the S5 trans, you have to use the S5 driveshaft.
Basically, it is isn't the engine, its the drivetrain that needs to stay in the family (S4 or S5) trans->driveshaft->differential
From what I have read, you cannot mix and match pieces.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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